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/20140824/201408241351033612759.jpg)
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![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103361683.jpg)
D 1min内电阻R上产生的热量为726J
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241351033291192.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103345583.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241351033612759.jpg)
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
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103361683.jpg)
D 1min内电阻R上产生的热量为726J
BC
本题考查变压器的问题,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
,电阻为
,由于二极管单向截止,故电压表示数是
;副线圈上的电流为负载上的电流:
,根据:
得原线圈电流为0.039A,1min内电阻R上产生的热量为
为365.04J
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103392683.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103345583.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103470754.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103532955.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103563792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135103922457.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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