Предмет: Физика, автор: khairullaminbashir22

№ 11. Сколько времени протекал по проводнику электрический ток силой 10 А, если при напряжении на концах проводника 220 В в нём выделилось количество теплоты, равное 132 кДж?
Ответ: ________с.​

Ответы

Автор ответа: 365ru
1

Ответ:

оличество теплоты,выделяемое проводником с током : Q=l*U*t=>t=Q/l*U;

t=132000/10*220=60c


khairullaminbashir22: Большое спасибо за помощь мне
пожалуйста, решите и другие мои проблемы.
Автор ответа: LymarIvan
0

Ответ:

60 с

Объяснение:

Дано:

I = 10 А

U = 220 В

Q = 132 кДж = 1,32×10^5 Дж

______________________

t - ?

По закону Джоуля-Ленца Q = I²Rt

По закону Ома I=\frac{U}{R}

Отсюда R=\frac{U}{I}\Rightarrow Q=\frac{I^2Ut}{I}  =IUt\Rightarrow t=\frac{Q}{IU}

t = 1,32×10^5 Дж / (10 А × 220 В) = 60 с

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