题目内容
如图所示,R1、R2为定值电阻,L为小灯泡,R3为光敏电阻,当照射光强度增大时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241704506382589.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241704506382589.png)
A.电压表的示数增大 | B.R2中电流强度增大 |
C.小灯泡的功率增大 | D.电源的路端电压降低 |
ACD
试题分析:当照射光强度增大时,光敏电阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170450841352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170451106549.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170451543500.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170451902327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170452089506.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170452385597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170452775361.png)
故选ACD
点评:动态电路分析的一般思路都是先分析局部电路的电阻变化,再分析整体电路中电流及电压的变化,最后分析局部电路中的电流及电压的变化;在分析局部电路时要注意灵活应用串并联电路的性质,还要注意电源是有内阻的。
![](http://thumb2018.1010pic.com/images/loading.gif)
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