“电阻的测量”实验是高中物理中比较重要的电学实验,在高考试题中出现的频率较高,是高考的热点之一。在众多的“电阻的测量”实验中,“伏安法测电阻”是最基本的方法之一,在这里我对伏安法测电阻的基本方法做一下小述。伏安法测电阻的基本原理是利用欧姆定律I=U/R,只要测出电阻两端的电压和通过电阻的电流即可得到电阻R=U/I。在处理这个问题要注意三个方面,即实验仪器的选择,电路的选择,控制电路的选择。1.实验仪器的选择电学仪器的选择主要包含电表、滑动变阻器、电源等。其基本原则是安全、准确、方便。即保证测量值均不超过使用量程, “Resistance measurement ” experiment is the more important high school physics experiment, appeared in the college entrance examination test frequency is higher, one of the hottest entrance. One of the most basic methods is to measure the voltammetry resistance in numerous measurements of resistance measurement. Here, I will briefly describe the basic method of voltammetry resistance measurement. The basic principle of voltammetry resistance measurement is the use of Ohm’s law I = U / R, as long as the measured voltage across the resistor and the current through the resistor can be obtained resistance R = U / I. In dealing with this issue should pay attention to three aspects, namely the choice of experimental equipment, the choice of circuits, control circuit selection. 1. The choice of experimental apparatus The choice of electrical instruments mainly includes meters, sliding rheostat, power supply and so on. The basic principle is safe, accurate and convenient. That is, to ensure that the measured value does not exceed the use of range,