题目内容
三相电源的连接如图所示,电路中的三个交流电压表的示数U1、U2、U3 间的关系是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000057853478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000057853478.png)
A.U1∶U2∶U3=1∶![]() | B.U1∶U2∶U3=1∶![]() |
C.U1∶U2∶U3=1∶2:1 | D.U1∶U2∶U3=![]() ![]() |
B
试题分析:在我国三相交流电采用三相四线制,三根火线一根零线,两根火线间的相位差1200,在这个电路中,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000005941349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000005957383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000005972377.png)
因此U1∶U2∶U3=1∶:1
![](http://thumb2018.1010pic.com/images/loading.gif)
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