伏安法测电源的电动势和内阻的实验,是近年来高考的热点.在本实验中,数据处理是重点,误差分析是难点.本文利用三种方法来讨论该实验的误差.一、利用闭合电路欧姆定律分析误差若不考虑电表电阻的影响,根据闭合电路欧姆定律:E=U+Ir,由两次测量列两方程为: The experiment of volt-ampere measurement of the electromotive force and internal resistance of the power supply is a hot spot in the college entrance examination in recent years. In this experiment, data processing is the focus, and error analysis is a difficult point. This paper uses three methods to discuss the error of the experiment. Closed circuit Ohm’s law analysis error If the influence of the meter resistance is not considered, according to the closed circuit Ohm’s law: E=U+Ir, the two equations are listed by two measurements: