题目内容
如图所示电路中,当滑动变阻器R的触头向下滑动时,( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027287023175.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027287023175.jpg)
A.灯泡![]() ![]() ![]() |
B.灯泡![]() ![]() ![]() |
C.灯泡![]() ![]() ![]() |
D.灯泡![]() ![]() ![]() |
D
试题分析:当滑动变阻器的滑动触头向下滑动时,接入电路的电阻减小,并联电路的总电阻减小,根据闭合电路欧姆定律得知,干路电流增大,路端电压减小,则知灯泡
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002728718313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002728733341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002728718313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002728733341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002728749350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002728749350.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.灯泡![]() ![]() ![]() |
B.灯泡![]() ![]() ![]() |
C.灯泡![]() ![]() ![]() |
D.灯泡![]() ![]() ![]() |