题目内容
如图甲所示的变压器为理想变压器,原线圈的匝数n1与副线圈的匝数年n2之比为10 :1。变压器的原线圈接如图乙所示的正弦式电流,两个阻值均为R=11Ω的定值电阻串联接在副线圈两端。两个交流电压表均为理想电表。则下列说法不正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500341803117565.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500341803117565.png)
A.通过两个定值电阻R的交变电流的频率为50Hz |
B.当t=1×10-2时,电压表V1示数为零 |
C.当t=1.5×10-2s时,电压表V2示数为11V |
D.原线圈的输入功率为22W |
B
试题分析:理想变压器原副线圈交流电频率不变,即通过两个定值电阻R的交变电流的频率等于原线圈频率即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418047955.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418062912.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418094619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418109542.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418125773.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418140535.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003418156818.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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