题目内容
如图所示,
、
、
是三个完全相同的小灯泡,串联后接在电压为6V的电路中,原来三个小灯泡都正常发光,现在三个小灯泡都不亮了.用电压表接在a、c两端时,示数是6V;接在a、b两端时,示数是0.接在b、d两端时,示数也是0,那么灯丝断了的小灯泡是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032312182530.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231171309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231202340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231202348.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032312182530.jpg)
A.![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
B
试题分析:本题是电路故障分析问题,用电压表测量各部分电压,电压表的示数等于电源电动势的那部分电路存在断路.若仅是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231249313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231265341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231311350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231249313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231265341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231249313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231311350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231265341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003231311350.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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