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Консультация № 192610
26.02.2018, 20:03
0.00 руб.
0
1
1
Здравствуйте! Прошу помощи в следующем вопросе:
К источнику с ЭДС E=9В и внутренним сопротивлением r=1Ом подключили параллельно соединённые лампу накаливания и резистор. Какое сопротивление R должен иметь резистор, чтобы лампа нормально горела,
если она рассчитана на напряжение U0=6В в силу тока I0=1А?
К источнику с ЭДС E=9В и внутренним сопротивлением r=1Ом подключили параллельно соединённые лампу накаливания и резистор. Какое сопротивление R должен иметь резистор, чтобы лампа нормально горела,
если она рассчитана на напряжение U0=6В в силу тока I0=1А?
Обсуждение
27.02.2018, 13:46
общий
это ответ
Здравствуйте, kesyarulit2015!
Эту задачу с "круглыми" числами можно решить "в уме".
Ток Ii источника, протекая через внутренне сопротивление r источника растекается на 2 "ручья". Часть его I0=1А течёт через лампу, а другая часть I2 - через резистор с искомым сопротивлением R .
Чтобы лампа светила нормально, необходимо, чтобы напряжение на ней было U0=6 Вольт. Следовательно, часть ЭДС E=9 Вольт источника надо загасить на внутреннем сопротивлении r самого источника.
Чтобы избыточные Ui=3 Вольта загасились на внутреннем сопротивлении r=1 Ом, надо чтобы через источник протекал ток
Ii=Ui / r = 3/1 = 3 Ампера.
Из этих 3х Ампер ток I0=1А течёт через лампу, а оставшиеся I2=2 Ампера - через резистор R, на котором напряжение такое же, как и на лампе, U0.
Следовательно , сопротивление резистора R= U0 / I2 = 6/2 = 3 Ома.
Нарисуйте эту простую цепь на бумажке, и Вам сразу всё станет понятно.
Эту задачу с "круглыми" числами можно решить "в уме".
Ток Ii источника, протекая через внутренне сопротивление r источника растекается на 2 "ручья". Часть его I0=1А течёт через лампу, а другая часть I2 - через резистор с искомым сопротивлением R .
Чтобы лампа светила нормально, необходимо, чтобы напряжение на ней было U0=6 Вольт. Следовательно, часть ЭДС E=9 Вольт источника надо загасить на внутреннем сопротивлении r самого источника.
Чтобы избыточные Ui=3 Вольта загасились на внутреннем сопротивлении r=1 Ом, надо чтобы через источник протекал ток
Ii=Ui / r = 3/1 = 3 Ампера.
Из этих 3х Ампер ток I0=1А течёт через лампу, а оставшиеся I2=2 Ампера - через резистор R, на котором напряжение такое же, как и на лампе, U0.
Следовательно , сопротивление резистора R= U0 / I2 = 6/2 = 3 Ома.
Нарисуйте эту простую цепь на бумажке, и Вам сразу всё станет понятно.
5
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