题目内容
有两个输出电压相同的交流电源,第一个电源外接一个电阻R1,第二个电源外接一个理想变压器,变压器的初级线圈匝数为n1,次级线圈的匝数为n2,变压器的负载为一个电阻R2,测得两个电源的输出功率相等.则此两电阻大小之比R1∶R2为
A.![]() ![]() | B.n1∶n2 |
C.n2∶n1 | D.![]() ![]() |
A
试题分析:由题知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113419306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113481659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113575659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113622351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113700678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113622351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113840999.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152113949453.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152114027688.png)
故选A
点评:注意理想变压器原副线圈输入输出功率相等。
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.![]() ![]() | B.n1∶n2 |
C.n2∶n1 | D.![]() ![]() |