题目内容
如图所示电路中,三只灯泡原都正常发光,当滑动变阻器的滑动触头P向右移动时,下面判断正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016473695554.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016473695554.jpg)
A.![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
AD
试题分析:当滑片右移时,滑动变阻器接入电阻增大,则电路中总电阻增大,由闭合电路欧姆定律可知电路中总电流减小,故
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647369313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647541356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647369313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647385341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647385341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647432350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647432350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647369313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647432350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647385341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647650493.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647666293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647432350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647369313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647541356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647385341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647369313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647541356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647385341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647369313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001647385341.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |