题目内容
如图甲所示的电路中,S为单刀双掷开关,电表为理想电表,Rt为热敏电阻(阻值随温度
的升高而减小),理想变压器原线圈接图乙所示的正弦交流电,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500285534518080.png)
的升高而减小),理想变压器原线圈接图乙所示的正弦交流电,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500285534518080.png)
A.变压器原线圈中交流电压u的表达式u=110![]() |
B.S接在a端,Rt温度升高时,变压器的输入功率变小 |
C.S接在a端,Rt温度升高时,电压表和电流表的示数均变大 |
D.S由a切换到b,Rt消耗的功率变大 |
A
试题分析:由图乙知交流电最大值Um=110
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855360344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028555161053.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855532308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855360344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855594309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855610518.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855641659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002855610518.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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