题目内容
如图所示,理想变压器的原线圈接在u=220
sin(100πt)(V)的交流电源上,副线圈接有R=55Ω的负载电阻。原、副线圈匝数之比为2∶1。电流表、电压表均为理想电表。下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150498772595.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115049861219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150498772595.gif)
A.原线圈中电流表的读数为1 A |
B.原线圈中的输入功率为![]() |
C.副线圈中电压表的读数为110![]() |
D.副线圈中输出交流电的周期为50s |
A
根据
可知副线圈电压为110
V,则其有效值即电压表示数为110V,C错。副线圈中电流
,
可知原线圈电流为1A,A选项正确。根据原线圈的输入功率等于副线圈的输出功率
,B错。变压器不改变交变电流的周期,故![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115050017638.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115049939453.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115049861219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115049970582.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115050002326.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115050002680.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115050017638.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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