题目内容
测量电源电动势和内电阻的器材如图A所示,请用实线表示导线,将图A中器材连成实验用电路,实验时经测量得出的数据如下表,请在下图B的方格纸上画出U—I图线。利用图线可求出电源电动势和内电阻分别为 、 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352667119101.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352671839152.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352667119101.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352668723926.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352671839152.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003526734922.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352676550711.png)
试题分析:为了减小误差,应将电压表直接并联在电源两端,电流表与滑动变阻器与电源串联;答案如图所示;
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035267806138.jpg)
由描点法将各点描出,用直线将各点相连;注意误差较大的点要舍去;
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035268125596.jpg)
U-I图像中与纵坐标的截距表示电源电动势,故由图可知,电源的电动势为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003526827597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035268431072.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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