题目内容
如图所示电路中,A、B两灯均正常发光,R为一滑动变阻器,P为滑动片,若将滑动片向下滑动,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241307141326481.png)
A.A灯变亮
B.B灯变亮
C.R1上消耗功率变太
D.总电流变小
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241307141326481.png)
A.A灯变亮
B.B灯变亮
C.R1上消耗功率变太
D.总电流变小
C
动片向下滑动,电阻变小,总电流变大,D错。内电压变大,路端电压变小,A灯变暗。A错。流过A的电流变小,总电流变大,流过
电流变大,
,R1上消耗功率变大。C对。
电压变大,B灯与R两端电压变小,B灯变暗,B错。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130714194327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130714226521.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130714194327.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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