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在电阻定律的教学中 ,涉及很多关于 U- I图象的问题 .当某电阻元件的伏安特性曲线呈非线性时 ,其电阻值跟图线的斜率是什么样的关系 ?对于此问题 ,在有些相关的资料中存在有较大的分歧 .如图 1所示的图线为某导体元件的伏安图 1特性曲线 (如小灯泡 ) ,其中线性图线部分的斜率可
In the teaching of resistance law, there are a lot of questions about U-I images. When the volt-ampere characteristic curve of a resistive element is nonlinear, what is the relationship between the resistance value and the slope of the graph? For this question, There are some disagreements in some related data. The graph shown in Fig. 1 is the volt-ampere diagram 1 characteristic curve of a conductor element (such as a small bulb), where the slope of the linear graph part can be