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电路问题十分重要,是高考中的热点问题。很多同学做题时,概念不清,不注意结论适用的条件,胡乱套用,丢分现象严重,下面是同学们经常出错的几个问题。一、电阻的伏安特性曲线对于定值电阻的伏安特性曲线,由于电流正比于电压,此曲线是过原点的一条倾斜直线,这类问题大家很熟悉。还有一类电阻的阻值随温度的变化而变化,其伏安特性曲线不再是直线,当遇到涉及这类电阻的问题时,很多同学就感到很头痛,不知如何下手。
Circuit problem is very important, is the hot issue in the entrance examination. Many students make problems, the concept is not clear, do not pay attention to the conditions for the conclusion, the indiscriminate application, drop points serious phenomenon, the following is a few students often make mistakes. First, the resistance of the volt-ampere characteristic curve For the value of the resistance volt-ampere characteristic curve, the current is proportional to the voltage, the curve is a straight line through the origin of such problems are familiar to you. There is also a resistance of the resistance changes with temperature changes, the volt-ampere characteristic curve is no longer a straight line, in the face of such resistance problems, many students feel very headache, I do not know how to start.