题目内容
如图所示,甲图为一理想变压器,其原副线圈匝数比n1∶n2=10 ∶1.当原线圈接乙图所示的正弦交流电.副线圈接负载电阻R=10Ω。 电压表、电流表均为理想表。求:
(1)原线圈两端电压的瞬时表达式;
(2)理想电压表及电流表读数分别是多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241741531436355.jpg)
(1)原线圈两端电压的瞬时表达式;
(2)理想电压表及电流表读数分别是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241741531436355.jpg)
(1)u=36
sin(100πt)(2)0.036A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174153159344.png)
试题分析:(1)Um=36
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174153159344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174153159344.png)
(2)输入电压的有效值为:U1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174153814553.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174154063469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174154344346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174154765522.png)
点评:本题需要掌握变压器的电压之比和匝数比之间的关系,
![](http://thumb2018.1010pic.com/images/loading.gif)
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