“电压”是初中生较难理解的概念,又是初中的一个重要概念。电压的单位涉及到电量和电功两个单位,而其中电功要在后一章才学习,学生无法把握各物理量之间的关系.严重影响着对电压单位的理解和大小的体会。在“电压”课的设计中笔者紧紧抓住实验的核心作用,化抽象为具体,有效地丰富其感性认识,并向理性作深入的探讨。激发了学生学习主动性,注重了学生观察、实验和思维能力的培养,取得了较好效果,使“电压”教学有一定突破和创新。一、反复类比深刻领会电压的作用 “Voltage” is a concept that is harder to understand for junior high school students and an important concept for junior middle school students. The unit of voltage involves two units of electric power and electric power. Among them, the electric power must be studied in the latter chapter. Students cannot grasp the relationship between the physical quantities and seriously affect the understanding of voltage units and the understanding of the size. In the design of the “voltage” course, the author firmly grasped the core role of the experiment, translated the abstract into concrete, effectively enriched his perceptual knowledge, and conducted in-depth discussions on rationality. It stimulated student’s initiative in learning, paid attention to the cultivation of students’ observation, experiment and thinking ability, achieved good results, and made certain breakthroughs and innovations in “voltage” teaching. One, repeated analogy profound understanding of the role of voltage