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Консультация № 197792
17.02.2020, 20:25
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Источники с ЭДС E1 = 6 В и E2 =9 В и внутренними сопротивлениями r1 = 5 Ом и r2 =10 Ом соответственно и резистор сопротивлением R =15 Ом соединили последовательно. Найдите силу тока I через резистор и напряжение U на нём. Источники соединены между собой одноимёнными полюсами.
Источники с ЭДС E1 = 6 В и E2 =9 В и внутренними сопротивлениями r1 = 5 Ом и r2 =10 Ом соответственно и резистор сопротивлением R =15 Ом соединили последовательно. Найдите силу тока I через резистор и напряжение U на нём. Источники соединены между собой одноимёнными полюсами.
Обсуждение
18.02.2020, 10:19
общий
это ответ
Здравствуйте, artemys03!
Дано : E1 = 6 В, E2 =9 В, r1 = 5 Ом, r2 =10 Ом, R =15 Ом.
Вычислить I и U.
Решение: Достаточно начертить Электро-схему, и тогда Вашу задачу можно решить "в уме". Зелёными прямоугольниками я обвёл так называемые "Схемы замещения" реальных источников. Внутри этих схем замещения мы видим идеальные источники ЭДС и их внутренние сопротивления.
В такой простейшей, неразветвлённой цепи суммарная ЭДС равна разности ЭДС двух источников, потому что источники согласно Условию задачи включены "встречно". То есть: E = E2 - E1 = 3 Вольта.
E2 , как бОльшая ЭДС из 2х, "толкает" ток в своём направлении, т.е: против часовой стрелки по рисунку. Тогда в точке U полярность напряжения положительна относительно точки 0.
Общее сопротивление цепи равно Ro = r1+r2+R = 5+10+15 = 30 Ом.
Ток в цепи I = E / Ro = 3 / 30 = 0,1 Ампер (по закону Ома).
Искомое напряжение на резисторе R равно U = I·R = 0,1·15 = 1,5 Вольт.
Ответ : I = 0,1 А, U = 1,5 В.
Дано : E1 = 6 В, E2 =9 В, r1 = 5 Ом, r2 =10 Ом, R =15 Ом.
Вычислить I и U.
Решение: Достаточно начертить Электро-схему, и тогда Вашу задачу можно решить "в уме". Зелёными прямоугольниками я обвёл так называемые "Схемы замещения" реальных источников. Внутри этих схем замещения мы видим идеальные источники ЭДС и их внутренние сопротивления.
В такой простейшей, неразветвлённой цепи суммарная ЭДС равна разности ЭДС двух источников, потому что источники согласно Условию задачи включены "встречно". То есть: E = E2 - E1 = 3 Вольта.
E2 , как бОльшая ЭДС из 2х, "толкает" ток в своём направлении, т.е: против часовой стрелки по рисунку. Тогда в точке U полярность напряжения положительна относительно точки 0.
Общее сопротивление цепи равно Ro = r1+r2+R = 5+10+15 = 30 Ом.
Ток в цепи I = E / Ro = 3 / 30 = 0,1 Ампер (по закону Ома).
Искомое напряжение на резисторе R равно U = I·R = 0,1·15 = 1,5 Вольт.
Ответ : I = 0,1 А, U = 1,5 В.
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