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在1985年5月出版的中专(工科)通用的《物理实验》教材中列入了“用伏安法测电阻”的实验。作者的意图除了使学生熟悉安培表、伏特表、变阻器等仪器的使用方法外,还给学生提供一种最简单的测量方法。并且使学生感知在使用“伏安法”时,什么条件下可以用安培表的外接法,又在什么情况下可以用安培表的内接法。这一实验无论在巩固学生知识、启发思维和体现“应用型”的要求等方面都是有意义的。但是,如果按1985年的《物理实验》所叙述的仪器去做,是有问题的。
In the textbook “Physical Experiments” published by the technical secondary school (Institute of Engineering) published in May 1985, the experiment of measuring resistance by voltammetry was included. In addition to making students familiar with the use of instruments such as ammeters, voltmeters, rheostats, etc., the author’s intentions also provide students with the simplest method of measurement. It also enables students to perceive the use of the “Volt-Ampere” method, under what conditions they can use the external connection method of the Ampere meter, and under what conditions they can use the internal connection method of the Ampere meter. This experiment is meaningful both in terms of consolidating student knowledge, inspiring thinking, and embodying the “application-type” requirements. However, if you follow the instruments described in the Physics Experiment of 1985, there is a problem.