某3G手机的电池上标着3.7V,通话时电流400mA.该手机通话5min,消耗的电能是多少J

2024-12-20 14:28:58
推荐回答(2个)
回答1:

I=400mA=0.4A
t=5min=300S
W=UIt=3.7V*0.4A*300s=444J

回答2:

W=UIt=3.7V*0.4A*5*60s=444J