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在初中物理教学中,学生对导体和绝缘体的概念容易理解,但对于导体和绝缘体之间没有绝对界线这一概念却感到困难。现介绍一种导体、绝缘体转换演示器的制作方法。该教具的基本结构见示意图。A是一个配有灯座的白炽灯(25W或15W)。用一只废白炽灯泡将其玻璃壳打碎,再把灯芯玻璃柱上露出的两根金属丝和灯丝剪掉,把它安装在灯座B上。C为开关,D为电源插头,用绝缘导线联接全部电路。实验时,将电源插头插入电源(220V),通过开关接通电路,此时灯泡A不亮。说明B处的灯泡玻
In junior high school physics teaching, students easily understand the concepts of conductors and insulators, but find it difficult to conceptualize the absence of absolute boundaries between conductors and insulators. Now introduced a conductor, insulator conversion demonstrator production methods. The basic structure of the teaching aids see diagram. A is an incandescent lamp with lamp holder (25W or 15W). With a waste incandescent bulbs to break the glass, and then wicked glass column exposed two wires and filaments cut off, it installed in the lamp holder B. C for the switch, D for the power plug, with insulated wire connection all the circuits. Experiment, the power plug into the power (220V), through the switch connected to the circuit, then the light bulb A is not bright. B lamp bulb