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Консультация № 159888
07.02.2009, 22:40
0.00 руб.
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3
1
Помогите пожалуйста с задачей,
Два одинаковых источника тока соеденены в одном случае последовательно, в другом параллельно и замкнуты на внешнее сопротивление 1 Ом. При каком внутреннем сопротивлении источника сила тока во внешней цепи будет в обоих случаях одинаковой?
Два одинаковых источника тока соеденены в одном случае последовательно, в другом параллельно и замкнуты на внешнее сопротивление 1 Ом. При каком внутреннем сопротивлении источника сила тока во внешней цепи будет в обоих случаях одинаковой?
Обсуждение
08.02.2009, 00:21
общий
это ответ
Здравствуйте, Каримова Венера Фаилевна!
Обозначим ЭДС одного источника через E, внутреннее сопротивление одного источника через r, силу тока во внешней цепи через I, внешнее сопротивление через R. При последовательном соединении источников их ЭДС и внутренние сопротивления суммируются; на основании 2-го закона Кирхгофа имеем: 2*E = I*(2*r + R) (1). При параллельном соединении источников к внешней цепи приложена их одна общая ЭДС, а общий ток во внешней цепи распределяется между источниками поровну, поэтому: E = (I/2)*r + I*R (2). Совместное решение (1) и (2) даёт: r = R = 1 Ом.
Обозначим ЭДС одного источника через E, внутреннее сопротивление одного источника через r, силу тока во внешней цепи через I, внешнее сопротивление через R. При последовательном соединении источников их ЭДС и внутренние сопротивления суммируются; на основании 2-го закона Кирхгофа имеем: 2*E = I*(2*r + R) (1). При параллельном соединении источников к внешней цепи приложена их одна общая ЭДС, а общий ток во внешней цепи распределяется между источниками поровну, поэтому: E = (I/2)*r + I*R (2). Совместное решение (1) и (2) даёт: r = R = 1 Ом.
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