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自感现象非常普遍,是一种特殊的电磁感应现象,是由于导体本身的电流变化而产生的电磁感应现象,学生学习《自感》的过程中,对自感电动势的作用(阻碍原电流的变化)理解不透,进而对自感现象的判断出现偏差,下面通过实例进行剖析和总结.1.“立即”和“逐渐”的问题例1如图1所示,线圈L与灯泡A串联,开关S闭合且达到稳定时,小灯泡能正常发光.则当闭合S和断开S的瞬间能观察到的现象分别是().
Self-inductance phenomenon is very common, is a special phenomenon of electromagnetic induction is due to the conductor itself changes in the current electromagnetic induction phenomenon, students learn “self-inductance” process, the role of self-induced electromotive force Change) to understand the impermeable, and then the phenomenon of self-inductance phenomenon discrepancy, the following examples through the analysis and summary.1 “immediately ” and “gradually ” problem Example 1 As shown in Figure 1, the coil L and When the light bulb A is connected in series and the switch S is closed and stable, the small light bulb can emit light normally, and the phenomenon observed when the switch S is closed and the switch S is disconnected is ().