各种材料的电阻率都随温度而变化是高中物理第二册《电阻定律》一节内容中的重点。在教学中，作者用电阻率随温度升高而增大的铁丝C、电阻率几乎不受温度影响的康铜丝B及电阻率随温度升高而减小的热敏电阻A等三种不同温度系数的材料制作如附图所示的实验装置，对增强学生理解电 The resistivity of various materials varies with temperature, which is the focus of the High School Physics second volume “The Law of Resistance”. In the teaching, the author used three different types: iron wire C, whose resistivity increased with increasing temperature, constantan wire B, whose resistivity was hardly affected by temperature, and thermistor A, whose resistivity decreased with increasing temperature. The temperature coefficient of the material is as shown in the figure, the experimental device, to enhance students’ understanding of electricity