题目内容
在下图的闭合电路中,当滑片P向右移动时,两电表读数的变化是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241449059732419.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241449059732419.jpg)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
B
试题分析:基本思路是“部分?整体?部分”,即从阻值变化的部分入手,由串、并联规律判断
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144909109403.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144909171367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144909358459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144906972459.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144909436356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144907128457.jpg)
故选B
点评:中等难度。电路的动态变化分析另一方法----极端法:即因变阻器滑动引起电路变化的问题,可将变阻器的滑动端分别滑至两个极端去讨论.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |