题目内容
如图,E为内阻不能忽略的电池,R1、R2、R3为定值电阻,S0、S为开关,
与
分别为电压表和电流表。初始时S0与S均闭合,现将S断开,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241536524943194.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153652463473.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153652478458.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241536524943194.jpg)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
B
试题分析:将S断开,R2所在之路电阻增大,由“串反并同”可知电流表示数增大,电压表与R2间接并联,电压表示数增大,B对;
点评:难度中等,判断此类问题,按照“局部、整体、局部”的步骤进行,也可利用“串反并同”的结论判断
![](http://thumb2018.1010pic.com/images/loading.gif)
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