针对中学物理教学中限流和分压电路各部分电流和电压变化规律这一教学难点,尝试利用电流、电压数字显示器,可拆换式滑动变阻器,小灯泡,可换元件等来制作数显限流和分压电路实验仪,让学生在实验操作、观察过程中对这两种电路的电流和电压变化规律有深刻的认识,使教学过程更加直观,轻松化解教学难点,激发学生的学习兴趣. In view of the teaching difficulty of current and voltage variation in current limiting and voltage divider circuit in high school physics teaching, try digital current limit and digital voltage display, removable rheostat, small bulb and exchangeable element Flow and partial pressure circuit tester, so that students in the experimental operation, observation of the two circuits of current and voltage variation of a profound understanding of the teaching process more intuitive, easy to solve the teaching difficulties, stimulate students interest in learning.