题目内容
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,把电路接通后,下列说法正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241616071152040.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241616071152040.png)
A.L1和L4一样亮 |
B.L2和L3一样亮 |
C.L3比L4亮 |
D.L1比L2亮 |
D
试题分析:根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161607240606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161607240606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161607645478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161607645478.png)
点评:本题考查了利用串并联电路的特点,找到电压分配关系和电流分配关系,从而判断电阻的实际功率。
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目