题目内容
某同学自制变压器,在做副线圈时,将外表涂有绝缘层的导线对折后并在一起在铁芯绕n2圈,导线的两个端头为a、b,从导线对折的中点引出了一个c接头,连线成如图所示的电路(线圈电阻不计).已知原线圈匝数为n1,原线圈的输入电压为u1=U0sint,则下列结论正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335599017760.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335599017760.png)
A.K打到b时,V表读数为![]() |
B.K打到b时,R中电流为零 |
C.K打到c时,V表读数为![]() |
D.K打到c时,R的电功率为 ![]() |
BCD
K打到b时,由题意知,a、b间无电压,R中的电流为0,A错,B对;由
得U2=
,C对;由
知,D对。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133600166844.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133600197699.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241336002441068.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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