1问题的提出笔者最近听取了一节关于人教版普通高中《物理》(必修)第2册“电感和电容对交变电流的影响”的公开教学课,教学过程中,有一学生问到电感元件产生的感抗对交变电流有阻碍作用,但为什么不会因此消耗电能,当时教者对这一问题只是搪塞而过.在评课过程中,该问题仍未解决. 1 Proposal of the question The author recently listened to a public teaching lesson on the effects of inductance and capacitance on the alternating current in the second edition of the People’s Education Edition of the General High School “Physics” (Compulsory). During the teaching process, one student asked about the inductance. The inductive reactance produced by the component has an impediment to the alternating current, but it does not consume power because of this. At that time, the teacher was only overwhelmed by this problem. During the course of the assessment, the problem remained unresolved.