初三物理中，玻璃加热到红炽状态变成导体的实验，在《教师教学用书》中介绍用断丝的废电灯泡心来做．但电灯泡心的玻璃质量比较大，加热到红炽状态需要的时间比较长．我在教学中找到了一种比较好的方法，供参考．课前，把玻璃烧至熔化，用铜线的一端粘上薄薄的一层玻璃．课上 The first three physics, the glass heated to red incandescent state into the conductor experiment, in the “teacher teaching book” to introduce broken filament waste light bulb heart to do. However, the quality of glass bulb heart, heated to the state of red Chi longer time. I found a better way in teaching for reference. Before class, the glass is burned until melted, and a thin layer of glass is attached to one end of the copper wire. in lesson