题目内容
如图所示,理想变压器原、副线圈的匝数比为1:10,接线柱a、b接在电压为u=22
sin(100
t)V的正弦交流电源上,R1为定值电阻,R2为热敏电阻(其阻值岁温度升高而减少)。则下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039342912356.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003934259344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003934291309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039342912356.jpg)
A.交流电频率为100![]() |
B.t=2s时,电压表的读数为220V |
C.当R2的温度升高时,电压表示数变小,电流表示数变大 |
D.当R2的温度升高时,R1的发热功率变大 |
B
试题分析:正弦交流电的瞬时电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039345251148.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003934712549.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003934727863.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003934743805.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003934915750.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935055708.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935086445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935102324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935117769.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935133293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935149354.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003935305653.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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