题目内容
如图甲所示,理想变压器原、副线圈的匝数比为10:1,R1=20
,R2=30
,C为电容器。已知通过R1的正弦交流电如图乙所示,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241707306799161.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170730024333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170730024333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241707306799161.png)
A.交流电的频率为50 Hz | B.原线圈输入电压的最大值为200![]() |
C.电阻R2的电功率约为6.67 W | D.通过R3的电流始终为零 |
AC
试题分析:根据变压器原理可知原副线圈中电流的周期、频率相同,周期为0.02s、频率为50赫兹,A正确;由图乙可知通过R1的电流最大值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170731802504.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170732067637.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170732442962.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170732676816.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170732878365.png)
故选AC.
点评:题需要掌握变压器的电压之比和匝数比之间的关系,同时对于电容器的作用要了解.
![](http://thumb2018.1010pic.com/images/loading.gif)
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