题目内容
如图甲所示,R为电阻箱
,置于阻值最大位置,
为未知电阻,(1)断开
,闭合
,逐次减小电阻箱的阻值,得到一组R、I值,并依据R、I值作出了如图乙所示的
图线,(2)断开
,闭合
,当R调至某一位置时,电流表的示数
;保持电阻箱的位置不变,断开
,闭合
,此时电流表的示数为
,据以上数据可知( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242153213184374.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215308853622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215309945355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215311100355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215312332318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215313736426.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215311100355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215312332318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215316560522.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215312332318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215311100355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215320117590.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242153213184374.jpg)
A.电源电动势为3.0 V |
B.电源内阻为0.5 Ω |
C.Rx的阻值为2 Ω |
D.![]() ![]() |
B
试题分析:由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215324469607.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215325577608.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215313736426.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215327012641.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215328119529.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215311100355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215312332318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215331302651.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215312332318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215311100355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215335233770.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215336372942.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215337511434.png)
故选B
点评:解决本题的关键知道R与
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215338805302.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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