电阻定律是高二物理第二章“恒定电流”的第三节内容(必修本).本章教材分为两大部分:前八节内容大部分在初中已经初步学过,只有少部分是已有知识的发展和应用,属于复习和提高的范畴;后四节教材是与闭合电路有关的内容,属于新知识的范畴,是本章教学的重点.对于电阻定律学生只知道定性结论,在前八节中,它是最重要的内容之一,同时也是较难学的,本章的教学要求是:(1)理解电阻率的概念,能认识并区分电阻与电阻率的物理意义.(2)掌握电阻定律,并能用 The law of resistance is the third section of the second chapter of the second chapter “Constant Current” (required). This chapter is divided into two parts. The contents of the first eight chapters are mostly learned in junior high school, and only a small part is the existing knowledge. The development and application of the textbook belong to the category of review and improvement; the last four textbooks are related to closed circuits and belong to the category of new knowledge. This is the focus of teaching in this chapter. For students of resistance law, only qualitative conclusions are known, in the first eight sections. It is one of the most important contents and it is also difficult to learn. The teaching requirements of this chapter are: (1) To understand the concept of resistivity, to recognize and distinguish the physical meaning of resistance and resistivity. (2) To master the law of resistance And can use