Предмет: Физика, автор: loveangelyou

Две электролампы сопротивлениями 200 и 400 Ом включены в сеть напряжением 220 В параллельно. Какая из ламп потребляет большую мощность и во сколько раз

Ответы

Автор ответа: ksensanina

P1=U²/R1
P2=U²/R2

U²/R1
P2/P1= ------------ = R1/R2=200/400=1/2
U²/R2

Отсюда следует,что первая лампочка потребляет большую мощность в 2 раза

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