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教《导体与绝缘体》一课时,学生检测完准备的材料后,我要他们分组汇报检测情况,其中一个学生说:“有的塑料是导体,有的塑料是绝缘体。”怎么会得出这样一个结论呢?他说:“塑料棒接在电路中,小灯泡不亮,而保鲜塑料袋接在电路中,小灯泡亮了。”有同学不相信,就说:“那你做给我们看看?”我叫他上台来演示,只见他用一根铜线放在保鲜塑料袋的下面,另一根铜线放在塑料袋上
When I was teaching class “Conductor and Insulator” for a class, after students finished examining the prepared materials, I asked them to report the grouping in groups. One of the students said: “Some plastic is a conductor and some plastic is an insulator.” How could one come to this conclusion? Conclusion? He said: “plastic bar connected to the circuit, a small light bulb is not bright, and fresh plastic bags connected to the circuit, a small light bulb.” Some students do not believe, said: “Then you do give us a look ? ”I told him to stage to demonstrate, I saw him with a copper wire on the plastic bag below, another copper wire on the plastic bag