在观察气体光谱及验证洛仑兹力等实验中，常常要用到高压电源。传统的感应圈结构简单牢固，调节方便，一般都能确保课堂演示实验的成功，因此，不少物理教师仍喜欢用感应圈来获得实验所需的高电压。但目前实验室中与感应圈相配接的低压电源由于增设了过载保护功能，在感应圈启 In experiments such as observation of gas spectra and verification of Lorentz force, high-voltage power supplies are often used. The traditional induction coil structure is simple and firm, easy to adjust, and generally can ensure the success of classroom demonstration experiments. Therefore, many physics teachers still like to use induction coils to obtain the high voltage required for experiments. However, the low-voltage power supply that is currently connected to the induction coil in the laboratory has an overload protection function, which is activated in the induction coil.