题目内容
图1为某一热敏电阻的I-U关系曲线图,在图2所示的电路中,电源电压恒为9v,电流表读数为70mA,定值电阻R1=250
,由热敏电阻的I-U关系曲线可知,热敏电阻两端的电压约为 v,热敏电阻的阻值约为
,电阻R2的阻值约为
。(结果均保留一位小数)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415004380941809.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150043575326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150043575326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150043575326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415004380941809.png)
5.2v 152.9
111.8
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150043575326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150043575326.png)
试题分析:
点评:先根据并联电路的电压规律,求出流经R1的电流,再根据并联电路的电流规律求出通过热敏电阻中的电流,然后再从图中读出对应的电压值,即为热敏电阻两端的电压;
![](http://thumb2018.1010pic.com/images/loading.gif)
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