220v,100w的阻值:
R=U×U/P=220×220/100=484(Ω)
220V,40W的阻值:
R=U×U/P=220×220/40=1210(Ω)
串联电流:
I=U/R=220/(484+1210)≈0.13(A)
L1的实际功率:
P=I×I×R=0.13×0.13×484≈8(W)
L2的实际功率:
P=I×I×R=0.13×0.13×1210≈20(W)
220v,100w的阻值:
R=U×U/P=220×220/100=484(Ω)
220V,40W的阻值:
R=U×U/P=220×220/40=1210(Ω)
串联电流:
I=U/R=220/(484+1210)≈0.13(A)
L1的实际功率:
P=I×I×R=0.13×0.13×484≈8(W)
L2的实际功率:
P=I×I×R=0.13×0.13×1210≈20(W)