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绝缘体变导体的演示实验是初中电学的一个重要实验 ,它揭示了自然界中量变到质变的矛盾转化规律 ,是对学生进行辨证唯物论教育的生动内容。采用人教社初中物理第二册第 5 0页图 4— 12的实验装置实验时很难成功 ,一般采用微安表或者用发光二极管代替小灯泡的方法来做。但因此时
Demonstration experiment of insulator change conductor is an important experiment of junior middle school electricity. It reveals the law of contradiction transformation from quantity change to qualitative change in nature. It is a vivid content of students’ dialectical materialism education. It is very difficult to use the experimental device experiment of the junior high school physics second book on page 50 of Fig. 4 to experiment successfully. Usually, the microampere meter or light emitting diode is used instead of the small light bulb. But when