灯L₁为6v-6w,灯L₂为6v-9w
R₁=6²/6
=6(Ω)
R₂=6²/9
=4(Ω)
P₁=9²/6
=13.5(W)
P₂=9²/4
=20.25(W)
P₂>P₁
答:灯L₁的实际功率为13.5W,灯L₂的实际功率为20.25W,灯L₂比灯L₁亮.
灯L₁为6v-6w,灯L₂为6v-9w
R₁=6²/6
=6(Ω)
R₂=6²/9
=4(Ω)
P₁=9²/6
=13.5(W)
P₂=9²/4
=20.25(W)
P₂>P₁
答:灯L₁的实际功率为13.5W,灯L₂的实际功率为20.25W,灯L₂比灯L₁亮.