题目内容
三只完全相同的电压表,如图所示接入电路中,已知V1的示数为12V,V2的示数为4V,V3的示数应是 ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241327290931540.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241327290931540.png)
A.大于8V,小于12V | B.大于4V,小于8V |
C.8V | D.12V |
C
因为电压表完全相同,可以将它们看成标准电阻,V1在干路上:
,V2在一条支路上:
,V3在另一条支路上:
,因为
,联立可解得V3的示数为8V
故选C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132729249460.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132729265483.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132729780536.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132729811477.png)
故选C
![](http://thumb2018.1010pic.com/images/loading.gif)
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