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九年义务教育三年制初级中学教科书,人教版第二册,导体和绝缘体这一节中的演示实验:玻璃是相当好的绝缘体,但如果给玻璃加热,使它达到红炽状态,它就变成了导体。课本中的实验装置如下图示:按以上方法做实验无法成功。用酒精灯加热玻璃时,看不到小灯泡发光。我分析实验失败的原
Nine-year Compulsory Education Three-year Junior High School Textbook, PEP Second Edition, Conductor and Insulator Demonstration experiment in this section: Glass is a fairly good insulator, but if the glass is heated to make it red, it It becomes a conductor. The experiment device in the textbook is as shown below: Experimenting with the above methods will not succeed. When you heat the glass with an alcohol lamp, you do not see the light bulb emitting light. I analyzed the original failure of the experiment