阿Q吧 > 有四盏灯，接入如图电路中，L1、L2都标有“220V，100W”字样，L3、L4都标有“220V，40W”字样，把电路接

有四盏灯，接入如图电路中，L1、L2都标有“220V，100W”字样，L3、L4都标有“220V，40W”字样，把电路接

2025-03-14 21:40:05
推荐回答（1个）
回答1：

根据P=
U2
R
可得，四个灯泡的电阻：
R1=R2=
U2
P2
=
2202
100
=484Ω，R3=R4=
U2
P4
=
2202
40
=1210Ω，
由电路图可知，L2与L3并联，所以电压相等，
根据P=
U2
R
可知：P2＞P3，
L1与L4串联，电流相等，
根据P=I2R可知，P4＞P1，
L1的电流大于L2的电流，
根据P=I2R可知：P1＞P2，
所以P4＞P1＞P2＞P3．
即由亮到暗依次是：L4，L1，L2，L3；
故选：D．

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