在高中物理电场教学中,通常用电力线来形象描述。近几年介绍演示电力线谱的方法甚多,我们综合各地介绍的方法,经过研究改进,制作了一套三件的电力线谱演示器。它用感应起电机(或高压静电发生器)供给电荷,可演示点电荷的电力线;同种或异种电荷的电力线;匀强电场中的电力线。 In high school physical electric field teaching, power lines are usually used to describe images. In recent years, many methods have been introduced to demonstrate the power line spectrum. We have integrated the methods introduced throughout the country. After research and improvement, we have produced a set of three power line spectrum demonstrators. It uses an induction motor (or high voltage electrostatic generator) to supply electric charge, a power line that can demonstrate point charges, a power line of the same kind or dissimilar charge, and a power line in a uniform electric field.