1. P=W/t=1KWh/25h=0.04kW=40W
答:功率40W.
2.454mA=0.454A
U=P/I=100W/0.454A=220.26V
答:额定电压是220.26V
3.R=U^2/P=(220V)^2/800W=60.5Ω
答:电阻丝的电阻60.5Ω
1. P=W/t=1KWh/25h=0.04kW=40W
答:功率40W.
2.454mA=0.454A
U=P/I=100W/0.454A=220.26V
答:额定电压是220.26V
3.R=U^2/P=(220V)^2/800W=60.5Ω
答:电阻丝的电阻60.5Ω