导体的伏安特性曲线能反映导体电阻的变化情况,常见的有I-U图线和U-I图线两种(为说明问题的方便,我们用U-I图线,以下引用的例子也如此处理).一些参考书认为曲线的斜率表示电阻,其实,这种认识是错误的.在《新教材完全解读》高二物理下第9页,有这样一段内容:“利用伏安特性曲线可 The volt-ampere characteristic curve of the conductor can reflect the variation of the conductor resistance. Commonly there are two types of IU diagram and UI diagram. (In order to illustrate the convenience of the problem, we use the UI diagram. The examples cited below are also treated as such). Some references The book thinks that the slope of the curve represents the resistance. In fact, this understanding is wrong. On page 9 of the “second reading of the new textbook” physics, there is such a paragraph: “Using the volt-ampere characteristic curve can be