题目内容
将阻值随温度升高而减小的热敏电阻Ⅰ和Ⅱ串联,接在不计内阻的稳压电源两端。开始时Ⅰ和Ⅱ阻值相等,保持Ⅰ温度不变,冷却或加热Ⅱ,则Ⅱ的电功率在
A.加热时变大,冷却时变小 | B.加热时变小,冷却时变大 |
C.加热或冷却时都变小 | D.加热或冷却时都变大 |
C
试题分析:设两个热敏电阻分别为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948729327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948729361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948760318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948729327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948729361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948807452.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948729327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004948729361.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.加热时变大,冷却时变小 | B.加热时变小,冷却时变大 |
C.加热或冷却时都变小 | D.加热或冷却时都变大 |