题目内容
图为一理想变压器,ab为原线圈,ce为副线圈,d为副线圈引出的一个接头。原线圈输入正弦式交变电压的u-t图象如右图所示。若只在ce间接一只Rce="400" Ω的电阻,或只在de间接一只Rde="225" Ω的电阻,两种情况下电阻消耗的功率均为80W。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082417084069210971.png)
(1)求只在ce间接400Ω的电阻时,原线圈中的电流I1;
(2)求ce和de 间线圈的匝数比
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082417084069210971.png)
(1)求只在ce间接400Ω的电阻时,原线圈中的电流I1;
(2)求ce和de 间线圈的匝数比
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170841175460.png)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170841581373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170841378627.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170841581373.png)
试题分析:1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241708417843209.png)
2)接ce时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241708419876136.png)
3)接ce时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241708422051825.png)
接de时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241708427201916.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241708429384182.png)
点评:掌握原副线圈的电压之比等于匝数比,输入功率等于输出功率,就能顺利解决此题.
![](http://thumb2018.1010pic.com/images/loading.gif)
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