一只家用电能表标着3000r⼀kW?h表示每消耗1kW.h的电能,电能表转盘转3000转,现在室内只接一只灯泡,测出

2025-04-25 21:37:50
推荐回答(1个)
回答1:

电能表转盘转动30r,电路消耗的电能为:
W=30×

1
3000
kW?h=0.01kW?h=3.6×104J,
灯泡单独工作时间;t=3min=3×60s=180s,
∵P=
W
t

∴灯泡的实际功率:
P=
W
t
=
3.6×104J
180s
=200W.
故答案为:200.