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我自制的一种教具可以演示初中物理现行教材中的“磁场对通电线圈作用”、“直流电动机工作原理”、“电磁感应”和“交流发电机工作原理”。现将制作过程介绍如下:
A self-made teaching aid can demonstrate the “magnetic field effect on the energized coil”, “the principle of the DC motor”, “electromagnetic induction” and “the working principle of the alternator” in the current textbook for junior middle school physics. The production process is now described as follows: