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1问题的来由笔者在上导体的伏安特性曲线新课时,讲到电学元件电流I和电压U的关系可以用图线来表示,画出的I-U图线叫做伏安特性曲线,在金属导体中,电流跟电压成正比,伏安特性曲线是通过坐标原点的直线(图1).具有这种伏安特性的电学元件叫做线性元件.提问学生图1中的两条直线哪一
1 The problem comes from the author in the conductor’s volt-ampere characteristics of the new lesson, the electrical component current I and the relationship between the voltage U can be represented by a graph, draw the IU graph called the volt-ampere characteristic curve, the metal conductor , The current is proportional to the voltage and the volt-ampere characteristic curve is the straight line passing through the origin of the coordinate (Figure 1). The electrical component with this volt-ampere characteristic is called a linear component. Ask the student what two of the straight lines in Figure 1