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在初中电学问题中,常常遇到因电路中的电阻在一定范围内的变化,导致电路中的电流、电压、电功等物理量的变化这一类问题。解决这类问题,应根据电路特点,将电阻的最大值或最小值代入题设的物理情境中,通过计算、分析、比较、判断、推理。能准确地找到电流、电压、电功等物理量的变化规律。这个方法我们把它叫做“极
In the junior high school electricity problem, it is often encountered that the resistance in the circuit changes within a certain range, leading to changes in the current, voltage, electrical work and other physical quantities in the circuit. To solve such problems, the maximum or minimum value of the resistance should be substituted into the physical context of the title according to the characteristics of the circuit, through calculation, analysis, comparison, judgment, and reasoning. Can accurately find the current, voltage, electrical work and other physical changes. This method we call it "polar