本书以中等职业学校机电类、电类专业学生所必备的基本知识为主线，主要讲述电路的基本知识、直流电路、电容器、磁与电、单相正弦交流电路、三相交流电路、变压器与电动机、安全用电与节约用电8章内容。每章均有学习目标、本章小结、思考与练习，并将技能训练融合在各知识点中，便于教学与自学。
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