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1、高中物理实验：测定电源的电动势和内阻,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,一、实验原理,（1）电流表，电压表，滑动变阻器 E= U + I r （2）电流表，电阻箱 E=I R+ I r （3）电压表，电阻箱 E=U + Ur/R,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copy
2、right 2004-2011 Aspose Pty Ltd.,一、实验原理,I,U,R,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,(1) 连接电路，开始开关应处于 断开状态滑动变阻器阻值调到最大.,二、实验步骤,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2
3、011 Aspose Pty Ltd.,(4)整理好器材,利用公式或U-I图象处理记录的数据,求出电源的E和r.,(3)闭合电键，调节滑动变阻器滑片的位置，读出 电流I、电压U的值,重复 5 次 ,列表记录.,(2)检查:电表的指针是否指零，量程选择合适,二、实验步骤,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,（2）测多组U、I 值，作出 U-I 图象。,注意： 1、画直线时，使直线两侧的点子数目大致相等
4、 2、坐标轴的起点是否为零。,三、数据处理,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,（测量值）,（真实值）,r 测 r真,E测 E真,四、误差分析（1）公式法,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,（测量值）,
5、（真实值）,r 测 r真,E测 = E真,四、误差分析(1)公式法,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,应该选取哪个电路来测定电源的电动势和内阻？,四、误差分析(1)公式法,如果RA已知，应该选用哪个电路？为什么？,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 20
6、04-2011 Aspose Pty Ltd.,r 测 r真,r 测 r真,E测 E真,E测 = E真,四、误差分析（2）图像法,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,r 测 r真,r 测 r真,E测 E真,E测 = E真,四、误差分析（3）等效电源,Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.,
