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讲人教版高中《物理》第二册(必修加选修)“电阻定律电阻率”时,在复习初中相关知识的基础上,通过演示实验得出了电阻定律,同时引入电阻率的概念,然后给出几种导体在20℃时的电阻率.但是,教材中为何给出在一定温度下导体的电阻率?电阻率与温度之间有何关系?为了说明这个问题,笔者自制了导体电阻率与温度关系的演示装置,通过实验来证明,取得了很好的教学效果.
When the PEP edition of the second edition of Physics for High School (compulsory and optional) “resistivity of the resistance law” was used, on the basis of reviewing the relevant knowledge of the junior middle school, the resistance law was derived through demonstration experiments, and the concept of resistivity was introduced. The resistivity of several conductors at 20°C is given. However, why is the resistivity of the conductor given at a certain temperature in the textbook? What is the relationship between resistivity and temperature? To illustrate this problem, the author made the conductor resistivity. The demonstration device related to temperature proves through experiments that it has achieved very good teaching results.