一、演示实验法教师应用演示实验,把要研究的物理现象生动的展现在学生面前,使其感到惊奇,产生疑问,引起思维,激发兴趣,从而引入新课.例如对“变阻器”一节的引入,可采用如下演示实验1.出示彩色可调亮度台灯,将其接入电路,闭合开关使之发光,然后调节旋钮使其由暗变亮再由亮变暗.设问:为什么? I. Demonstration experiment method The teacher applies the demonstration experiment to vividly display the physical phenomena to be studied in front of the students, making them wonder, questioning, thinking, and inspiring interest, thereby introducing new lessons. For example, the “varistor” The introduction of the festival, the following demonstration experiments can be used to show the color adjustable brightness table lamp, connect it to the circuit, close the switch to make it light, and then adjust the knob to make it from dark to bright and then light and dark. Set Q: Why?