题目内容
(4分)某同学用伏安法测一节干电池的电动势E和内电阻r,他测出6组数据并把它们描在U—I图中,如图所示。请你在图中做出必要的图像根据图像求出该电池的电动势E= V,电阻r = Ω(结果保留两位小数)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241500152145951.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241500152145951.jpg)
作图见解析 1.46---1.54 、 0.48---0.54
试题分析:图线如下图,图线与纵轴交点为电源电动势E=1.46~1.54V,图线的斜率的绝对值等于内阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241500152301158.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241500153555963.jpg)
点评:中等偏易。本题求内阻不能用
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150015464648.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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