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初中物理的电学部分,许多实验和内容都涉及安培表和伏特表。一般实验用的安培表和伏特表都是“两个量程三个接线柱”。关于怎样正确读数和正确选用接线柱是学生实验中出错率较高的问题。而一般演示电表和学生实验电表存在刻度比例小不利于课堂讲解的弊端。下面介绍一种简单电表教具的制作方法,供同行们参考。
In the electrical part of junior high school physics, many experiments and contents involve ammeters and voltmeters. The amperometric and voltmeters used in general experiments are “three posts of three ranges.” The question of how to correctly read and use the binding posts is a high error rate in student experiments. The disadvantages of the small scale ratio of the general demonstration electricity meter and the student’s experimental electricity meter are not conducive to the disadvantages of classroom explanation. The following describes a simple meter teaching aids for reference.