【摘要】 介绍了“一感二用”自感演示器的设计原理、制作方法、实验现象和揭示规律．该设计既能演示通电时的自感现象及其规律，又能演示断电时的自感现象及其规律．更多还原

【Abstract】 The article is to introduce the demonstrator of One Inductance coil, Two Functions, option of parts and experimental phenomenon as well as the law, which it reveals. The design demonstrates the phenomenon and law of self-inductance both under the condition of power on and power off.更多还原