Question

1一只6V3W的灯泡灯丝电阻多大正常发光时通过灯丝的电流如果把它接在8V的电路中 灯的实际功率多大2一只Pz220-10

Answer 1

1：P=UI I=P/U=0.5A

R=U/I=12Ω

P=U平方/R =5.33W

2:已知电压220V 功率100W

R=U平方/P =220*220/100 =484Ω

W = PT = 100*3600 =360000 J