(1)两灯并联后的等效电阻:R=U/I=24V/0.5A=48欧
(2)L2的电阻:R2=U/I2=24V/0.4A=60欧
(3)L1的电流:I1=0.5A-0.4A=0.1A
(4)L1的电阻:R1=U/I1=24V/0.1A=240欧
并联电路电阻R=R1*R2/R1+R2
(1)两灯并联后的等效电阻:R=U/I=24V/0.5A=48欧
(2)L2的电阻:R2=U/I2=24V/0.4A=60欧
(3)L1的电流:I1=0.5A-0.4A=0.1A
(4)L1的电阻:R1=U/I1=24V/0.1A=240欧
并联电路电阻R=R1*R2/R1+R2