题目内容
如图所示,电源电动势为4 V,当接通K时,灯L1和L2均不亮,用电压表测得Uab=0,Ubc=0,Ucd=Uad="4" V。由此可知断路处是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131929767181.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131929782399.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131929767181.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131929782399.png)
A.灯L1 | B.灯L2 |
C.灯L1和L2 | D.变阻器R |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241319298761138.png)
D
Uad="4" V,Ubc=0,则断路不在bc间。Ucd="4" V,则断路在cd间。所以选D。
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.灯L1 | B.灯L2 |
C.灯L1和L2 | D.变阻器R |