交变电流这一章牵涉到磁场、电磁感应、恒定电流中的欧姆定律、电功、电功率和电流热效应等多方面的知识,解题时涉及到瞬时值、最大值、有效值和平均值的应用,稍有不慎就会犯张冠李戴的错误,因此,在学习本章知识时,务必弄清以下几个问题. 一、表征交变电流的几个物理量 The chapter on alternating current involves knowledge of magnetic fields, electromagnetic induction, Ohm’s law in constant current, electric power, electric power, and current thermal effects. The problem-solving involves instantaneous, maximum, rms and average Application, a little mistake will make mistakes, therefore, in the study of this chapter knowledge, be sure to find out the following questions .A few characterization of alternating current physical