题目内容
如图(甲)是“测定电源电动势和内阻”实验的电路图,根据实验测得的几组I、U数据作出U—I图象如图(乙)所示,由图象可确定:该电源的电动势为 V,电源的内电阻为
(计算结果保留两位有效数字).
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038118915001.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003811860333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038118915001.jpg)
1.40(1.39或1.41); 0.57(0. 55~0.59都得分)
试题分析:由图(乙)所示图象可知,电源电动势是1.40V,电源内阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038119071368.png)
故答案为:(1)0.740;(2)1.40,0.57.
![](http://thumb2018.1010pic.com/images/loading.gif)
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