限于大纲要求和教材篇幅，中学教材对自感现象的介绍比较简略，但那些爱寻根问底的学生常提出一些问题，而有些是似是而非易于混淆的问题，很有必要解释清楚．图１１．如图１所示电路，在切断电源时，自感线圈和电阻Ｒ仍构成回路，自感线圈中储存的能量通过电阻泄放，这种情况 Confined to the outline requirements and teaching materials, the introduction of self-inductance phenomenon in middle school textbooks is relatively simple, but students who love to ask questions often ask questions, and some are plausible but not confusing. It is necessary to explain clearly. Figure 11. As shown in Figure 1, when the power is cut off, the self-inductance coil and the resistor R still form a loop, and the stored energy in the self-inductance coil is discharged through the resistor.