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Консультация № 162325
12.03.2009, 21:24
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Помогите решить задачу. Падение напряжения во внешней цепи равно U = 5,1 В. Определить ток в цепи, ЭДС и КПД источника тока, если его внутреннее сопротивление r = 1,5 Ом, а сопротивление внешней цепи R = 8 Ом.
Обсуждение
Неизвестный
12.03.2009, 22:18
общий
это ответ
Здравствуйте, Marishanov!
По закону Ома для участка цепи, включающего сопротивление R, ток равен I=U/R=0,6375 А. Из закона Ома для замкнутой цепи получаем формулу для ЭДС:
E=(R+r)I=6,05625 В. КПД определяется как отношение полезной работы Ап=U*I к затраченной Aз=E*I. Или КПД=Ап/Аз*100%=U/E*100%=84%.
Успехов!
По закону Ома для участка цепи, включающего сопротивление R, ток равен I=U/R=0,6375 А. Из закона Ома для замкнутой цепи получаем формулу для ЭДС:
E=(R+r)I=6,05625 В. КПД определяется как отношение полезной работы Ап=U*I к затраченной Aз=E*I. Или КПД=Ап/Аз*100%=U/E*100%=84%.
Успехов!
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