题目内容
如图所示,理想变压器原线圈的匝数n1=1 100匝,副线圈的匝数n2=110匝,R0、R1、R2均为定值电阻,且R0=2Ω、R1是标有“20V 10W”的小灯泡,原线圈接
u=311sin(314t)(V)的交流电源.当开关S闭合时,小灯泡R1恰好正常发光。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355512435677.png)
求:(1)定值电阻R2的阻值;
(2)S闭合时电流表的示数;
(3)S断开后,假设小灯泡R1不会被烧坏,且可认为其电阻不变,则电压表的示数为多少?
u=311sin(314t)(V)的交流电源.当开关S闭合时,小灯泡R1恰好正常发光。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355512435677.png)
求:(1)定值电阻R2的阻值;
(2)S闭合时电流表的示数;
(3)S断开后,假设小灯泡R1不会被烧坏,且可认为其电阻不变,则电压表的示数为多少?
(1)
(2)0.1A(3)21V
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551321598.png)
(6分)(1)
副线圈中电流
灯中
(2)(3分)S闭合时,
(3)(3分)S断开后,灯![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355517891541.png)
本题考查的是理想变压器的基本规律的相关问题,熟练掌握基本规律的公式就可快速解出此题。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551368971.png)
副线圈中电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551431826.png)
灯中
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551509530.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551571667.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551321598.png)
(2)(3分)S闭合时,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135551727808.png)
(3)(3分)S断开后,灯
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241355517891541.png)
本题考查的是理想变压器的基本规律的相关问题,熟练掌握基本规律的公式就可快速解出此题。
![](http://thumb2018.1010pic.com/images/loading.gif)
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