题目内容
NTC热敏电阻器即负温度系数热敏电阻器,也就是指阻值随温度的升高而减小的电阻。负温度系数的热敏电阻R 2接入如右图所示电路中,R1为定值电阻, L为小灯泡,当温度降低时(不考虑灯泡和定值电阻阻值随温度变化)( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029516612923.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029516612923.jpg)
A.小灯泡变亮 | B.小灯泡变暗 |
C.![]() | D.电流表的示数减小 |
AD
试题分析:负温度系数的热敏电阻的特性:温度升高,电阻减小.根据温度下降,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002951692361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002951692361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002951708500.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002951676327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002951739549.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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