“用伏安法测电阻”是初中物理的重点实验,其原理是欧姆定律,即利用待测的电阻两端的电压和通过电阻的电流,间接地测出电阻值．事实上,电阻测量的考题绝不仅仅局限于“伏安法”,有大量的题目只给出电压表或电流表中的一种,对其他器材的限制也各不相同．现对测电阻的一些非常规的方法分析归纳如下． “Testing resistance with voltammetry” is a key experiment in junior high school physics. Its principle is Ohm’s law, which uses the voltage across the resistance to be measured and the current through the resistance to indirectly measure the resistance. In fact, the question of resistance measurement is in no way limited to “Volt-Ampere”, there are a large number of questions that only give one of the voltmeter or ammeter, and the restrictions on other devices are also different. Some unconventional methods for measuring resistance are summarized below.