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课本中关于电磁感应的描述是这样的：闭合电路的一部分导体在磁场中做切割磁感线运动时，导体中就产生电流，这种现象叫做电磁感应，产生的电流叫做感应电流．怎样理解电磁感应呢？本文试从七个方面加以讨论：1．“闭合电路”是任何电路中有电流存在的必要条件，断路不可能形成
The description of electromagnetic induction in a textbook is as follows: When a part of a conductor in a closed circuit cuts magnetic flux in a magnetic field, a current is generated in the conductor. This phenomenon is called electromagnetic induction, and the resulting current is called induced current. How to understand electromagnetic induction? This article tries to discuss from seven aspects: 1. “Closed circuit” is a necessary condition for the existence of a current in any circuit. It is impossible to form a closed circuit.