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Вариант 6, страница 82 - гдз по физике 8 класс дидактические материалы Марон, Марон
Авторы: Марон А. Е., Марон Е. А.
Тип: Дидактические материалы
Издательство: Просвещение
Год издания: 2022 - 2026
Уровень обучения: базовый
Цвет обложки: белый
ISBN: 978-5-09-111138-5
Популярные ГДЗ в 8 классе
Самостоятельные работы. СР-8. Сила тока. Напряжение. Сопротивление. Закон Ома для участка цепи - страница 82.
App\Models\Task {#1030 // resources/views/models/task/default.blade.php #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1470325 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-6" "field_display_title" => "Вариант 6" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1036 #items: [] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1034 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1073 #items: array:1 [ 0 => App\Models\Branch {#1035 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1469778 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Самостоятельные работы" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1038 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "62" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1037 #items: array:1 [ 0 => App\Models\Book {#1039 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1040 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_class" => Illuminate\Database\Eloquent\Collection {#1042 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1044 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_author" => Illuminate\Database\Eloquent\Collection {#1046 #items: array:2 [ …2] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1049 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1050 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1052 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1054 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1056 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1057 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1058 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1060 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_publication_number" => "4" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1062 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1064 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2022" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "661" "field_priority" => null "field_default_folder" => "/fizika_08/maron-dm/" "field_isbn" => "978-5-09-111138-5" "field_cover" => array:1 [ 0 => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ …4] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1065 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1066 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1067 #items: [] #escapeWhenCastingToString: false } "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1068 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 379 "subject" => 556 "class_subject" => 492 ] ] #original: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1040} "field_class" => Illuminate\Database\Eloquent\Collection {#1042} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1044} "field_author" => Illuminate\Database\Eloquent\Collection {#1046} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1049} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1050} "field_country" => Illuminate\Database\Eloquent\Collection {#1052} "field_city" => Illuminate\Database\Eloquent\Collection {#1054} "field_series" => Illuminate\Database\Eloquent\Collection {#1056} "field_umk" => Illuminate\Database\Eloquent\Collection {#1057} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1058} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1060} "field_publication_number" => "4" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1062} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1064} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2022" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "661" "field_priority" => null "field_default_folder" => "/fizika_08/maron-dm/" "field_isbn" => "978-5-09-111138-5" "field_cover" => array:1 [ 0 => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ …4] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1065} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1066} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1067} "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1068} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 379 "subject" => 556 "class_subject" => 492 ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1070 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1469778 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Самостоятельные работы" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1038} "field_page_start" => "62" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1037} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1070} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1146 #items: array:2 [ 0 => App\Models\Branch {#1071 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1469778 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Самостоятельные работы" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1074 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "62" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1072 #items: array:1 [ 0 => App\Models\Book {#1075 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1076 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_class" => Illuminate\Database\Eloquent\Collection {#1078 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1080 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_author" => Illuminate\Database\Eloquent\Collection {#1082 #items: array:2 [ …2] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1085 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1086 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1088 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1090 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1092 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1093 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1094 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1096 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_publication_number" => "4" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1098 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1100 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2022" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "661" "field_priority" => null "field_default_folder" => "/fizika_08/maron-dm/" "field_isbn" => "978-5-09-111138-5" "field_cover" => array:1 [ 0 => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ …4] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1101 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1102 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1103 #items: [] #escapeWhenCastingToString: false } "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1104 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 379 "subject" => 556 "class_subject" => 492 ] ] #original: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1076} "field_class" => Illuminate\Database\Eloquent\Collection {#1078} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1080} "field_author" => Illuminate\Database\Eloquent\Collection {#1082} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1085} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1086} "field_country" => Illuminate\Database\Eloquent\Collection {#1088} "field_city" => Illuminate\Database\Eloquent\Collection {#1090} "field_series" => Illuminate\Database\Eloquent\Collection {#1092} "field_umk" => Illuminate\Database\Eloquent\Collection {#1093} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1094} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1096} "field_publication_number" => "4" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1098} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1100} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2022" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "661" "field_priority" => null "field_default_folder" => "/fizika_08/maron-dm/" "field_isbn" => "978-5-09-111138-5" "field_cover" => array:1 [ 0 => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ …4] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1101} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1102} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1103} "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1104} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 379 "subject" => 556 "class_subject" => 492 ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1106 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1469778 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Самостоятельные работы" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1074} "field_page_start" => "62" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1072} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1106} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Branch {#1107 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1469786 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "СР-8. Сила тока. Напряжение. Сопротивление. Закон Ома для участка цепи" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1108 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "81" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1109 #items: array:1 [ 0 => App\Models\Book {#1110 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1111 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_class" => Illuminate\Database\Eloquent\Collection {#1113 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1115 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_author" => Illuminate\Database\Eloquent\Collection {#1117 #items: array:2 [ …2] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1120 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1121 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1123 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1125 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1127 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1128 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1129 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1131 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_publication_number" => "4" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1133 #items: array:1 [ …1] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1135 #items: [] #escapeWhenCastingToString: false } 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=> "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1139 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #original: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1111} "field_class" => Illuminate\Database\Eloquent\Collection {#1113} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1115} "field_author" => Illuminate\Database\Eloquent\Collection {#1117} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1120} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1121} "field_country" => Illuminate\Database\Eloquent\Collection {#1123} "field_city" => 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"978-5-09-111138-5" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1136} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1137 …1} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1138 …2} "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1139 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1141 #items: array:1 [ 0 => App\Models\Branch {#1142 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1469778 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Самостоятельные работы" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1143 …2} "field_page_start" => "62" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1144 …2} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1145 …2} ] #original: array:24 [ "id" => 1469778 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Самостоятельные работы" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1143 …2} "field_page_start" => "62" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1144 …2} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1145 …2} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1469786 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "СР-8. Сила тока. Напряжение. Сопротивление. Закон Ома для участка цепи" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1108} "field_page_start" => "81" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1109} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1141} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1147 #items: array:2 [ 0 => App\Models\Element {#1157 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1760899 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1166 #items: array:1 [ 0 => App\Models\Edition {#1158 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 6406 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1160 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "stas" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1161 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1162 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1163 …2} "field_content_source" => null ] #original: array:21 [ "id" => 6406 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1160 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "stas" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1161 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1162 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1163 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1470325" "type" => "task" ] "text" => "<p><strong>Вариант 6</strong></p><p><strong>1.</strong> Через поперечное сечение проводника за 2 с проходит $12 \cdot 10^{19}$ электронов. Какова сила тока в проводнике?</p><p><strong>2.</strong> Сколько метров медного провода площадью поперечного сечения $2 \text{ мм}^2$ нужно взять, чтобы его сопротивление было равно $1 \text{ Ом}$?</p><p><strong>3.</strong> Сила тока в электрическом чайнике $3 \text{ А}$ при напряжении $220 \text{ В}$. Чему равно сопротивление чайника?</p>" "img" => array:1 [ 0 => array:5 [ "name" => "6-1.jpg" "alt" => null "width" => "1448" "height" => 588 "path" => "/media/fizika_08/maron-dm/0-cp08/6-1.webp?ts=1760803290" ] ] ] #original: array:7 [ "id" => 1760899 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1166} "task" => array:2 [ "refs" => "1470325" "type" => "task" ] "text" => "<p><strong>Вариант 6</strong></p><p><strong>1.</strong> Через поперечное сечение проводника за 2 с проходит $12 \cdot 10^{19}$ электронов. Какова сила тока в проводнике?</p><p><strong>2.</strong> Сколько метров медного провода площадью поперечного сечения $2 \text{ мм}^2$ нужно взять, чтобы его сопротивление было равно $1 \text{ Ом}$?</p><p><strong>3.</strong> Сила тока в электрическом чайнике $3 \text{ А}$ при напряжении $220 \text{ В}$. Чему равно сопротивление чайника?</p>" "img" => array:1 [ 0 => array:5 [ "name" => "6-1.jpg" "alt" => null "width" => "1448" "height" => 588 "path" => "/media/fizika_08/maron-dm/0-cp08/6-1.webp?ts=1760803290" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1164 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1820314 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1174 #items: array:1 [ 0 => App\Models\Edition {#1165 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 6684 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1168 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1169 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1170 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1171 …2} "field_content_source" => null ] #original: array:21 [ "id" => 6684 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1168 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1169 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1170 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1171 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1470325" "type" => "task" ] "text" => "<p><strong>1.</strong> <strong>Дано:</strong></p><p>$t = 2$ с (время)</p><p>$N = 12 \cdot 10^{19}$ (число электронов)</p><p>$e \approx 1.6 \cdot 10^{-19}$ Кл (заряд одного электрона, постоянная)</p><p><strong>Найти:</strong></p><p>$\text{I}$ (сила тока)</p><p><strong>Решение:</strong></p><p>Сила тока $\text{I}$ — это физическая величина, равная отношению электрического заряда $\text{q}$, прошедшего через поперечное сечение проводника, ко времени его прохождения $\text{t}$. Формула для силы тока:</p><p>$I = \frac{q}{t}$</p><p>Общий заряд $\text{q}$, прошедший через проводник, можно найти, умножив число электронов $\text{N}$ на элементарный заряд $\text{e}$:</p><p>$q = N \cdot e$</p><p>Объединив две формулы, получим:</p><p>$I = \frac{N \cdot e}{t}$</p><p>Подставим известные значения в формулу и произведем расчет:</p><p>$I = \frac{12 \cdot 10^{19} \cdot 1.6 \cdot 10^{-19} \text{ Кл}}{2 \text{ с}} = \frac{12 \cdot 1.6}{2} \text{ А} = 6 \cdot 1.6 \text{ А} = 9.6 \text{ А}$</p><p><strong>Ответ:</strong> сила тока в проводнике равна 9.6 А.</p><p><strong>2.</strong> <strong>Дано:</strong></p><p>$S = 2$ мм² (площадь поперечного сечения)</p><p>$R = 1$ Ом (сопротивление)</p><p>Материал — медь. Удельное сопротивление меди $\rho$ является справочной величиной.</p><p>$S = 2 \text{ мм}^2 = 2 \cdot 10^{-6} \text{ м}^2$</p><p>$\rho \approx 1.7 \cdot 10^{-8}$ Ом·м</p><p><strong>Найти:</strong></p><p>$\text{L}$ (длина провода)</p><p><strong>Решение:</strong></p><p>Сопротивление проводника $\text{R}$ зависит от его длины $\text{L}$, площади поперечного сечения $\text{S}$ и удельного сопротивления материала $\rho$. Эта зависимость выражается формулой:</p><p>$R = \rho \frac{L}{S}$</p><p>Чтобы найти длину провода $\text{L}$, выразим ее из данной формулы:</p><p>$L = \frac{R \cdot S}{\rho}$</p><p>Теперь подставим числовые значения (в системе СИ):</p><p>$L = \frac{1 \text{ Ом} \cdot 2 \cdot 10^{-6} \text{ м}^2}{1.7 \cdot 10^{-8} \text{ Ом} \cdot \text{м}} = \frac{2}{1.7} \cdot 10^2 \text{ м} \approx 117.65 \text{ м}$</p><p><strong>Ответ:</strong> нужно взять примерно 117.65 м медного провода.</p><p><strong>3.</strong> <strong>Дано:</strong></p><p>$I = 3$ А (сила тока)</p><p>$U = 220$ В (напряжение)</p><p><strong>Найти:</strong></p><p>$\text{R}$ (сопротивление)</p><p><strong>Решение:</strong></p><p>Для нахождения сопротивления воспользуемся законом Ома для участка цепи. Он гласит, что сила тока $\text{I}$ на участке цепи прямо пропорциональна напряжению $\text{U}$ на концах этого участка и обратно пропорциональна его сопротивлению $\text{R}$:</p><p>$I = \frac{U}{R}$</p><p>Из этой формулы выразим искомое сопротивление $\text{R}$:</p><p>$R = \frac{U}{I}$</p><p>Подставим известные значения в формулу:</p><p>$R = \frac{220 \text{ В}}{3 \text{ А}} \approx 73.33 \text{ Ом}$</p><p><strong>Ответ:</strong> сопротивление чайника равно примерно 73.33 Ом.</p>" ] #original: array:6 [ "id" => 1820314 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1174} "task" => array:2 [ "refs" => "1470325" "type" => "task" ] "text" => "<p><strong>1.</strong> <strong>Дано:</strong></p><p>$t = 2$ с (время)</p><p>$N = 12 \cdot 10^{19}$ (число электронов)</p><p>$e \approx 1.6 \cdot 10^{-19}$ Кл (заряд одного электрона, постоянная)</p><p><strong>Найти:</strong></p><p>$\text{I}$ (сила тока)</p><p><strong>Решение:</strong></p><p>Сила тока $\text{I}$ — это физическая величина, равная отношению электрического заряда $\text{q}$, прошедшего через поперечное сечение проводника, ко времени его прохождения $\text{t}$. Формула для силы тока:</p><p>$I = \frac{q}{t}$</p><p>Общий заряд $\text{q}$, прошедший через проводник, можно найти, умножив число электронов $\text{N}$ на элементарный заряд $\text{e}$:</p><p>$q = N \cdot e$</p><p>Объединив две формулы, получим:</p><p>$I = \frac{N \cdot e}{t}$</p><p>Подставим известные значения в формулу и произведем расчет:</p><p>$I = \frac{12 \cdot 10^{19} \cdot 1.6 \cdot 10^{-19} \text{ Кл}}{2 \text{ с}} = \frac{12 \cdot 1.6}{2} \text{ А} = 6 \cdot 1.6 \text{ А} = 9.6 \text{ А}$</p><p><strong>Ответ:</strong> сила тока в проводнике равна 9.6 А.</p><p><strong>2.</strong> <strong>Дано:</strong></p><p>$S = 2$ мм² (площадь поперечного сечения)</p><p>$R = 1$ Ом (сопротивление)</p><p>Материал — медь. Удельное сопротивление меди $\rho$ является справочной величиной.</p><p>$S = 2 \text{ мм}^2 = 2 \cdot 10^{-6} \text{ м}^2$</p><p>$\rho \approx 1.7 \cdot 10^{-8}$ Ом·м</p><p><strong>Найти:</strong></p><p>$\text{L}$ (длина провода)</p><p><strong>Решение:</strong></p><p>Сопротивление проводника $\text{R}$ зависит от его длины $\text{L}$, площади поперечного сечения $\text{S}$ и удельного сопротивления материала $\rho$. Эта зависимость выражается формулой:</p><p>$R = \rho \frac{L}{S}$</p><p>Чтобы найти длину провода $\text{L}$, выразим ее из данной формулы:</p><p>$L = \frac{R \cdot S}{\rho}$</p><p>Теперь подставим числовые значения (в системе СИ):</p><p>$L = \frac{1 \text{ Ом} \cdot 2 \cdot 10^{-6} \text{ м}^2}{1.7 \cdot 10^{-8} \text{ Ом} \cdot \text{м}} = \frac{2}{1.7} \cdot 10^2 \text{ м} \approx 117.65 \text{ м}$</p><p><strong>Ответ:</strong> нужно взять примерно 117.65 м медного провода.</p><p><strong>3.</strong> <strong>Дано:</strong></p><p>$I = 3$ А (сила тока)</p><p>$U = 220$ В (напряжение)</p><p><strong>Найти:</strong></p><p>$\text{R}$ (сопротивление)</p><p><strong>Решение:</strong></p><p>Для нахождения сопротивления воспользуемся законом Ома для участка цепи. Он гласит, что сила тока $\text{I}$ на участке цепи прямо пропорциональна напряжению $\text{U}$ на концах этого участка и обратно пропорциональна его сопротивлению $\text{R}$:</p><p>$I = \frac{U}{R}$</p><p>Из этой формулы выразим искомое сопротивление $\text{R}$:</p><p>$R = \frac{U}{I}$</p><p>Подставим известные значения в формулу:</p><p>$R = \frac{220 \text{ В}}{3 \text{ А}} \approx 73.33 \text{ Ом}$</p><p><strong>Ответ:</strong> сопротивление чайника равно примерно 73.33 Ом.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1470326" "type" => "task" ] "previous" => array:2 [ "refs" => "1470324" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1198 #items: array:1 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"field_default_folder" => "/fizika_08/maron-dm/" "field_isbn" => "978-5-09-111138-5" "field_cover" => array:1 [ 0 => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" "alt" => "" "width" => "2294" "height" => "3039" ] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1191 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1192 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1193 #items: [] #escapeWhenCastingToString: false } "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1194 #items: array:1 [ 0 => App\Models\Term {#1195 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 45 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "белый" "field_cases" => array:6 [ …6] "field_translit" => "belyy" ] #original: array:6 [ "id" => 45 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "белый" "field_cases" => array:6 [ …6] "field_translit" => "belyy" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 379 "subject" => 556 "class_subject" => 492 ] ] #original: array:50 [ "id" => 1038 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1148} "field_class" => Illuminate\Database\Eloquent\Collection {#1156} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1150} "field_author" => Illuminate\Database\Eloquent\Collection {#1151} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1175} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1176} "field_country" => Illuminate\Database\Eloquent\Collection {#1178} "field_city" => Illuminate\Database\Eloquent\Collection {#1180} "field_series" => Illuminate\Database\Eloquent\Collection {#1182} "field_umk" => Illuminate\Database\Eloquent\Collection {#1183} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1184} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1186} "field_publication_number" => "4" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1188} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1190} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2022" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "661" "field_priority" => null "field_default_folder" => "/fizika_08/maron-dm/" "field_isbn" => "978-5-09-111138-5" "field_cover" => array:1 [ 0 => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/fizika_08/maron-dm/covers/cover1.webp?ts=1760461989" "alt" => "" "width" => "2294" "height" => "3039" ] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1191} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1192} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1193} "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1194} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 379 "subject" => 556 "class_subject" => 492 ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "page" => Illuminate\Database\Eloquent\Collection {#1212 #items: array:1 [ 0 => App\Models\BookPage {#1211 #connection: "mysql" #table: "book_pages" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 1469686 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/page-82" "field_display_title" => "82" "field_folder" => "1" "field_image_name" => "82" "field_branch_parent" => Illuminate\Database\Eloquent\Collection {#1213 #items: [] #escapeWhenCastingToString: false } "field_weight" => "0" "field_book_parent" => Illuminate\Database\Eloquent\Collection {#1214 #items: array:1 [ 0 => App\Models\Book {#1154} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "edition_groups" => Illuminate\Database\Eloquent\Collection {#1215 #items: [] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1225 #items: array:1 [ 0 => App\Models\Element {#1224 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1761566 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1226 …2} "book_page" => array:2 [ …2] "img" => array:1 [ …1] ] #original: array:6 [ "id" => 1761566 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1226 …2} "book_page" => array:2 [ …2] "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1469687" "type" => "book_page" ] "previous" => array:2 [ "refs" => "1469685" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1384 #items: array:5 [ 0 => App\Models\Task {#1396 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1470322 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "81" "field_page_end" => "82" "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-3" "field_display_title" => "Вариант 3" "field_outside_task" => "0" "field_task_type" => Illuminate\Database\Eloquent\Collection {#1397 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1398 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1399 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1400 …2} "content" => Illuminate\Database\Eloquent\Collection {#1402 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1408 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1470322 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "81" "field_page_end" => "82" "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-3" "field_display_title" => "Вариант 3" "field_outside_task" => "0" "field_task_type" => Illuminate\Database\Eloquent\Collection {#1397 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1398 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1399 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1400 …2} "content" => Illuminate\Database\Eloquent\Collection {#1402 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1408 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Task {#1403 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1470323 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-4" "field_display_title" => "Вариант 4" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1401 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1410 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1406 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1404 …2} "content" => Illuminate\Database\Eloquent\Collection {#1405 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1420 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1470323 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-4" "field_display_title" => "Вариант 4" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1401 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1410 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1406 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1404 …2} "content" => Illuminate\Database\Eloquent\Collection {#1405 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1420 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Task {#1415 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1470324 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-5" "field_display_title" => "Вариант 5" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1407 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1422 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1418 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1416 …2} "content" => Illuminate\Database\Eloquent\Collection {#1417 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1432 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1470324 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-5" "field_display_title" => "Вариант 5" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1407 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1422 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1418 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1416 …2} "content" => Illuminate\Database\Eloquent\Collection {#1417 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1432 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 3 => App\Models\Task {#1427 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1470325 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-6" "field_display_title" => "Вариант 6" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1419 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1434 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1430 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1428 …2} "content" => Illuminate\Database\Eloquent\Collection {#1431 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1429 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1470325 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-6" "field_display_title" => "Вариант 6" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1419 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1434 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1430 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1428 …2} "content" => Illuminate\Database\Eloquent\Collection {#1431 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1429 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 4 => App\Models\Task {#1439 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1470326 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => "83" "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-7" "field_display_title" => "Вариант 7" "field_outside_task" => "0" "field_task_type" => Illuminate\Database\Eloquent\Collection {#1440 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1441 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1442 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1443 …2} "content" => Illuminate\Database\Eloquent\Collection {#1445 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1451 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1470326 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => "83" "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-7" "field_display_title" => "Вариант 7" "field_outside_task" => "0" "field_task_type" => Illuminate\Database\Eloquent\Collection {#1440 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1441 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1442 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1443 …2} "content" => Illuminate\Database\Eloquent\Collection {#1445 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1451 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } ] #original: array:21 [ "id" => 1469686 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/page-82" "field_display_title" => "82" "field_folder" => "1" "field_image_name" => "82" "field_branch_parent" => Illuminate\Database\Eloquent\Collection {#1213} "field_weight" => "0" "field_book_parent" => Illuminate\Database\Eloquent\Collection {#1214} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "edition_groups" => Illuminate\Database\Eloquent\Collection {#1215} "content" => Illuminate\Database\Eloquent\Collection {#1225} "next" => array:2 [ "refs" => "1469687" "type" => "book_page" ] "previous" => array:2 [ "refs" => "1469685" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1384} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1470325 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "82" "field_page_end" => null "field_url" => "/8-klass/fizika/maron-didakticheskie-materialy/cp08-6" "field_display_title" => "Вариант 6" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1036} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1034} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1073} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1146} "content" => Illuminate\Database\Eloquent\Collection {#1147} "next" => array:2 [ "refs" => "1470326" "type" => "task" ] "previous" => array:2 [ "refs" => "1470324" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1198} "page" => array:2 [ "refs" => "1469686" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] }
Вариант 6 (с. 82)
Условие. Вариант 6 (с. 82)
скриншот условия
Вариант 6
1. Через поперечное сечение проводника за 2 с проходит $12 \cdot 10^{19}$ электронов. Какова сила тока в проводнике?
2. Сколько метров медного провода площадью поперечного сечения $2 \text{ мм}^2$ нужно взять, чтобы его сопротивление было равно $1 \text{ Ом}$?
3. Сила тока в электрическом чайнике $3 \text{ А}$ при напряжении $220 \text{ В}$. Чему равно сопротивление чайника?
Решение. Вариант 6 (с. 82)
1. Дано:
$t = 2$ с (время)
$N = 12 \cdot 10^{19}$ (число электронов)
$e \approx 1.6 \cdot 10^{-19}$ Кл (заряд одного электрона, постоянная)
Найти:
$\text{I}$ (сила тока)
Решение:
Сила тока $\text{I}$ — это физическая величина, равная отношению электрического заряда $\text{q}$, прошедшего через поперечное сечение проводника, ко времени его прохождения $\text{t}$. Формула для силы тока:
$I = \frac{q}{t}$
Общий заряд $\text{q}$, прошедший через проводник, можно найти, умножив число электронов $\text{N}$ на элементарный заряд $\text{e}$:
$q = N \cdot e$
Объединив две формулы, получим:
$I = \frac{N \cdot e}{t}$
Подставим известные значения в формулу и произведем расчет:
$I = \frac{12 \cdot 10^{19} \cdot 1.6 \cdot 10^{-19} \text{ Кл}}{2 \text{ с}} = \frac{12 \cdot 1.6}{2} \text{ А} = 6 \cdot 1.6 \text{ А} = 9.6 \text{ А}$
Ответ: сила тока в проводнике равна 9.6 А.
2. Дано:
$S = 2$ мм² (площадь поперечного сечения)
$R = 1$ Ом (сопротивление)
Материал — медь. Удельное сопротивление меди $\rho$ является справочной величиной.
$S = 2 \text{ мм}^2 = 2 \cdot 10^{-6} \text{ м}^2$
$\rho \approx 1.7 \cdot 10^{-8}$ Ом·м
Найти:
$\text{L}$ (длина провода)
Решение:
Сопротивление проводника $\text{R}$ зависит от его длины $\text{L}$, площади поперечного сечения $\text{S}$ и удельного сопротивления материала $\rho$. Эта зависимость выражается формулой:
$R = \rho \frac{L}{S}$
Чтобы найти длину провода $\text{L}$, выразим ее из данной формулы:
$L = \frac{R \cdot S}{\rho}$
Теперь подставим числовые значения (в системе СИ):
$L = \frac{1 \text{ Ом} \cdot 2 \cdot 10^{-6} \text{ м}^2}{1.7 \cdot 10^{-8} \text{ Ом} \cdot \text{м}} = \frac{2}{1.7} \cdot 10^2 \text{ м} \approx 117.65 \text{ м}$
Ответ: нужно взять примерно 117.65 м медного провода.
3. Дано:
$I = 3$ А (сила тока)
$U = 220$ В (напряжение)
Найти:
$\text{R}$ (сопротивление)
Решение:
Для нахождения сопротивления воспользуемся законом Ома для участка цепи. Он гласит, что сила тока $\text{I}$ на участке цепи прямо пропорциональна напряжению $\text{U}$ на концах этого участка и обратно пропорциональна его сопротивлению $\text{R}$:
$I = \frac{U}{R}$
Из этой формулы выразим искомое сопротивление $\text{R}$:
$R = \frac{U}{I}$
Подставим известные значения в формулу:
$R = \frac{220 \text{ В}}{3 \text{ А}} \approx 73.33 \text{ Ом}$
Ответ: сопротивление чайника равно примерно 73.33 Ом.
Другие задания:
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