题目内容
如图,一理想变压器的原、副线圈的匝数比是20:1,原线圈接入
的正弦交流电,一只理想二极管和一个阻值为
的电阻串联后接在副线圈上。则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241554296146431.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241554293331264.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155429489422.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241554296146431.png)
A.电流表示数为0.055A |
B.电压表示数约为7.8V |
C.二极管两端的最大电压为![]() |
D.1min内电阻R上产生的热量为726J |
BC
试题分析:原线圈电压有效值为220v,原、副线圈的匝数比是20:1,所以副线圈电压有效值为11v,最大值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155429879497.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155429973823.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155430238992.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155430332799.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155430456459.png)
点评:本题难度较小,处理本题的关键是明确电压表、电流表的示数为有效值,二极管具有单向导电性,再求解电功率时用到的是电压或电流的有效值
![](http://thumb2018.1010pic.com/images/loading.gif)
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