题目内容
如图的电路中,电源内阻r≠0,R1和R2是两个定值电阻.当滑动变阻器R的滑片向a移动时,电路中电流I1、I2的变化是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305581751296.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305581751296.png)
A.I1不变 | B.I1变小 | C.I2变大 | D.I2变小 |
BC
当滑动变阻器R的滑片向a移动时,电阻减小,内外电路属于串联关系,根据串联分压关系(电阻越大分压越多)可知路端电压减小(
)则I1变小,据
可知电路中电流增大,
可知I2变大,选BC
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130558207584.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130558222613.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130558253443.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.I1不变 | B.I1变小 | C.I2变大 | D.I2变小 |