I1^2×R3=1W I2^2×R4=4W
L1×I1 =U1 I2×L1=U2
U2=2U1=>I2=2I1=>R3=R4
I1=12/(R2+R3+R1)I2=12/(R4+R1) => R3=2/3R2
计算出R2=24Ω=>R3=R4=16Ω=>R1=8Ω
灯L1的额定功率=I^2×R1=(12/24)^2×8Ω=2W
灯L1的电阻值=8Ω
I1^2×R3=1W I2^2×R4=4W
L1×I1 =U1 I2×L1=U2
U2=2U1=>I2=2I1=>R3=R4
I1=12/(R2+R3+R1)I2=12/(R4+R1) => R3=2/3R2
计算出R2=24Ω=>R3=R4=16Ω=>R1=8Ω
灯L1的额定功率=I^2×R1=(12/24)^2×8Ω=2W
灯L1的电阻值=8Ω