纵观近几年的高考试题,有关交变电流的知识虽不是高考的重点部分,但涉及该内容知识的考题每年都会有。涉及该内容的高考试题,既有对该内容知识的单独考查(命题频率较高的知识点有交变电流的变化规律、图象、有效值的计算,变压器的电压比、电流比),也有把该内容知识和力学、电学内容相联系的综合考查。但在该内容的学习中学生存在一 Throughout the college entrance examination exams in recent years, although the knowledge of alternating current is not a key part of the college entrance examination, but the contents of the knowledge of the exam each year there will be. Related to the content of the college entrance examination questions, both the content of the knowledge of a separate test (knowledge of higher frequency of the topic alternating current changes, image, RMS calculations, the transformer voltage ratio, current ratio), The contents of knowledge and mechanics, electrical content linked to a comprehensive examination. But there is one student in the content learning