在高中《物理》第二册 (必修加选修 )第十七章“电磁感应”一章中“自感”和“日光灯原理”两节内容的教学中 ,做好自感现象的演示实验至关重要 .自感现象是导体自身电流发生变化而产生的电磁感应现象 ,教材用如图 1、2图 1所示两个电路分别演示通、断电时的自感现象 .在图 1的 In the teaching of “Self-induction” and “Principles of Fluorescent Lamps” in Chapter 17 of the “Induction of Electromagnetic Induction” chapter in Physics “Volume 2 (Compulsory and Optional), the demonstration experiment of self-induction phenomenon is very important. Important. The self-inductance phenomenon is the electromagnetic induction phenomenon caused by the change of the current of the conductor itself. The teaching materials use the two circuits shown in Fig. 1, 2 and Fig. 1 respectively to demonstrate the self-inductance phenomenon when they are switched on and off. In Fig. 1