Предмет: Физика, автор: tarasevichshum

кипятильник мощность 480 вт изготовлен из нихромовой проволоки сечением 0.24 мм^2 и включён в сеть с напряжением 220 вольт какова длина проволоки из которой изготовлен кипятильник???

Ответы

Автор ответа: fatt52

Ответ:

22 м

Объяснение:

ρ=1.1 Ом*мм²/м P=480 Вт S=0.24 мм² U=220 B L=?

===

P=U²/R

R=ρ*L/S

L=U²*S/(P*ρ)=220²*0.24/(480*1.1)=22 м

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