Предмет: Физика, автор: elizaveta333

напряжение на лампе 80В, а ее сопротивление 400 Ом. какова мощность тока в лампе?

Ответы

Автор ответа: nelle987

P=UI=U^2/R=6400/400=16 Вт

Автор ответа: NY444

$I=frac{U}{R}=frac{80}{400}=0.2 A$

тогда мощность лампы:

$P=I^2*R=0.2^2*400=0.04*400=16 W$

Ответ: мощность лампы 16 ватт

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