题目内容
电阻R1、R2与交流电源按照如图甲所示方式连接,R1=10 Ω,R2=20 Ω.合上开关S后,通过电阻R2的正弦交变电流i随时间t变化的情况如图乙所示.则 ( ).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242131260953384.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242131260953384.png)
A.通过R1的电流有效值是0.6 A |
B.R1两端的电压有效值是6 V |
C.通过R2的电流最大值是1.2![]() |
D.R2两端的电压最大值是6![]() |
AB
试题分析:由i-t图可知,电流的最大值
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213128560621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213129324560.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213130182327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213130947361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242131320701009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213127047344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213134036807.png)
故选AB
点评:本题结合电阻的串联考查了交流的最大值和有效值关系,属于基础题目,平时要加强基础知识的训练.
![](http://thumb2018.1010pic.com/images/loading.gif)
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