题目内容
如图所示,R1=10
,R2=8
,电源内阻不可忽略,当开关S接a点时,电压表示数
为2V;当S接b点时,电压表的示数不可能是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241503185612952.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150318281333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150318281333.png)
为2V;当S接b点时,电压表的示数不可能是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241503185612952.jpg)
A.2.1V | B.1.9V |
C.1.6V | D.1.5V |
ACD
试题分析:如果从a端搬到b端电路中电流没有发生变化,则由欧姆定律U=IR可知R2两端电压为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150318577859.png)
点评:本题难度中等,要能够应用串联分压原理和闭合电路欧姆定律灵活应用解题
![](http://thumb2018.1010pic.com/images/loading.gif)
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