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为了激发学生的学习兴趣,在介绍断电自感现象时,老师经常会做断电时小灯泡闪亮的实验。J2246型自感演示器断电回路中使用的是氖管,它替代了课本的小灯泡,讲解时很不方便,而且效果也不明显。于是笔者准备自制一套实验装置来演示课本中的实验。由于没有现成的实验器材的参数,于是利用电流传感器来获取断电前后灯泡和线圈中的电流与时问的关系,从而来调整实验参数以达到观察小灯泡“闪
In order to arouse students’ interest in learning, when introducing the phenomenon of power-off self-inductance, teachers often do experiments that shine small light bulbs when power is off. J2246 self-inductance demonstrator circuit is used in the neon tube, it replaces textbooks of small bulbs, explain very inconvenient, but the effect is not obvious. So I prepare a set of home-made experimental device to demonstrate the textbook experiment. Because there is no existing experimental equipment parameters, so the use of current sensors to get the power before and after the light bulb and coil in the relationship between current and time, in order to adjust the experimental parameters to observe the small bulb ”flash