一、引言贵刊在2012年第10期刊登的《自感现象面面观》一文,对断电自感现象中为什么会产生高压的原因作了分析,笔者认为值得商榷.该文认为,根据公式E=L(ΔI)/(Δt),若电流变化很快,且自感系数很大,就会产生高压.在日常的教学中,也有很多学生甚至有教师也简单地根据公式认为,自感电动势跟电流的变化率成正比,只要电流变化率(ΔI)/(Δt)大,自感系数L足够大, I. INTRODUCTION Your article “Self-inductance Phenomenon” published in the 10th issue of 2012, analyzes why the high voltage occurs in the self-inductance phenomenon, which is worth discussing. This paper argues that according to the formula E = L (ΔI) / (Δt), if the current changes quickly, and the self-inductance is large, it will produce high pressure in the daily teaching, there are many students and even teachers simply according to the formula that self-induced electromotive force Proportional to the rate of change of current, as long as the rate of change of current (ΔI) / (Δt) is large and the inductance L is large enough,