题目内容
如图所示,理想变压器原线圈接入交流电
,副线圈接有一电压表和电阻为R 的负载,电压表的示数为10V.在t=
时(T为交变电流的周期),原线圈两端的电压的瞬时值为
V。由此可知变压器的原副线圈的匝数之比为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241211146972147.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114479729.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114526333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114557412.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241211146972147.png)
A.![]() |
B.![]() |
C.10:1 |
D.1:10 |
C
理想变压器原线圈接入交流电
,在t=
时,瞬时值
,则可知原线圈电压的有效值为100V,已知电压表的示数为10V,根据原副线圈两端电压与匝数成正比,即
,故C正确
故选C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114479729.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114526333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114838758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121114884918.png)
故选C
![](http://thumb2018.1010pic.com/images/loading.gif)
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