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在《电阻》一节教学中,不少版本的教材,在探究导体的电阻大小与哪些因素有关的实验设计环节上,主要侧重探究导体的长度、横截面积、材料三个因素影响导体的电阻大小,整个探究过程都比较详实,并且突出了“控制变量”的思想方法;而对“温度”也能够影响导体的电阻大小则作了淡化处理,轻笔带过,只是给出:“导体的电阻还与温度有关”的结论,但没有实验验证展示。这无疑给学生留下了疑团:温度到底是如何影响导体的电阻大小的呢?我们都知道:自然界
In the teaching of “resistance”, many versions of the teaching materials explore the experimental design aspects of the resistance of the conductors and what factors are involved. The main focus is to explore the length, cross-sectional area and material of the conductors. Three factors influence the resistance of the conductor. Size, the whole inquiry process is more detailed, and highlights the “control variables” approach; and “temperature” can also affect the size of the conductor resistance is desalted, light pen over, only given :"Conductor resistance is also related to temperature”, but there is no experimental verification display. This undoubtedly left a question for the students: How does temperature affect the size of the conductor’s resistance? We all know that: Nature