Предмет: Физика, автор: didenkovadik

к источнику тока подключили лампочку сила тока протекающая по ней =250 мА определить сопротивление лампочки если ЭДС источника тока =4.5В внутреннее сопротивление r=1 Ом .

Ответы

Автор ответа: Amigo3
0
Обозначим сопротивление лампы R, силу тока I. Тогда I=E/(R+r)⇒R+r=E/I⇒R=(E/I)-r=(4,5/250*10-³)-1=17 Ом.

Ответ: 17 Ом.
Автор ответа: Amigo3
0
Пишите, если ещё будут вопросы
Автор ответа: didenkovadik
0
250*10^-3 cтепени?
Автор ответа: Amigo3
0
Да, это же миллиамперы
Автор ответа: didenkovadik
0
надо ещё одну задачу порешать
Автор ответа: didenkovadik
0
Электроплита, рассчитана на номинальное напряжение U0 при включении в сеть с этим напряжением,потребляет мощность Р=400 Вт. Определить мощность, потребляемую двумя плитами номинальными мощностями Р0=600Вт , если их включить в сеть параллельно.
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