自感现象的演示实验,是不少物理教师感到不容易做好的一个实验,有关书刊对此进行了不少的讨论.笔者拜读后深受启发,但感到仍有进一步讨论的必要.本文从物理实验方法和学生学习、理解过程两个角度总结了笔者多年来对这一课题的研究心得,以求教于同行.1 现行教材所采用的实验方法分析图1和图2所示的分别是现行高中物理课本所采用的自感演示实验电路图.图1所示的电路用于演示通电时的自感现象:当开关S接通时,可见到灯A_2几乎立即变亮,而灯A_1是逐渐变亮的(尽管最后稳定时与A_2亮度一样),这说明在接通电源 Demonstration experiment of self-inductance phenomenon is an experiment that many physics teachers find it difficult to do well. The relevant books and periodicals have done a lot of discussions. The author was deeply inspired after reading, but felt that there is still need for further discussion. The physics experiment method and the students’ learning and understanding process summarize the author’s research experience on this subject over the years to seek advice from colleagues.1 The experimental methods used in the current textbook analysis are shown in Figure 1 and Figure 2 respectively. The self-inductance demonstration experiment circuit used in high school physics textbooks. The circuit shown in Fig. 1 is used to demonstrate the self-induction phenomenon when power is on: when the switch S is turned on, it can be seen that the light A_2 is almost immediately lightened, and the lamp A_1 is gradually changed Bright (although it is the same brightness as A_2 at the end of stability), this means that the power is turned on