题目内容
如图所示的电路中,闭合开关S后,将滑动变阻器R的滑片P向上移动,则有( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241446509243858.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241446509243858.jpg)
A.V1表读数变小 | B.V2表读数变小 |
C.A表读数变小 | D.通过电阻R的电流变小 |
BD
试题分析:由滑动变阻器R的滑片P向上移动,R的阻值变大,所以全电路的总电阻变大,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144650970612.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144651095605.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144651329603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144651392581.png)
点评:本题要求学生明确动态分析的总体思路是先局部由滑动变阻器阻值的变化得出总电阻的变化,再整体据闭合电路的欧姆定律得出电路中总电流的变化,再局部就是由串、并联电路的特点去分析。
![](http://thumb2018.1010pic.com/images/loading.gif)
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