题目内容
如图所示的电路中,电源电动势为E,内电阻为r且小于灯泡L1的冷态电阻(不发光时的电阻)。开关闭合后两灯泡均发光,现在将滑动变阻器的滑片P稍向下滑动,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030266052853.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030266052853.jpg)
A.电源的内电压减小 | B.电灯L1变亮 |
C.电流表读数变小 | D.电源的输出功率变小 |
ACD
试题分析:滑片向下互动,滑动变阻器阻值变大,并联电阻变大,总电阻变大,总电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003026620614.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003026652526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003026667313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003026667313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003026698341.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.电源的内电压减小 | B.电灯L1变亮 |
C.电流表读数变小 | D.电源的输出功率变小 |