1 电阻率与温度关系的演示笔者为演示金属导体电阻率随温度变化而变化,设计了如下实验: 实验器材:演示电表1只、低压学生电源1只、带插芯的日光灯丝一根(可由废旧日光灯管中,把灯丝好的一端轻轻击破灯管而得,由于钨丝易断,敲击时应十分小心)、插座1只(用于安装日光灯丝)、导线若干. 电路及安装:电原理图如图1所示,实物连接如图2所示. 1 Demonstration of the relationship between resistivity and temperature The author designed the following experiment to demonstrate that the resistivity of a metal conductor changes with temperature: Experimental equipment: 1 demo meter, 1 low voltage student power supply, and a fluorescent filament with a ferrule In the waste fluorescent tubes, light ends of the filaments are lightly broken by the lamp. Since the tungsten wire is easy to break, it should be very careful when tapping), socket 1 (for installing fluorescent filaments), wires, etc. Circuit and installation: Electrical schematic shown in Figure 1, the physical connection shown in Figure 2.