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一、函数法例:如图所示,电源电压恒定不变,R=50欧,要使电流最小,滑片 P 应置于何处?分析与解:由欧姆定律 I=U/R
First, the function of the law: as shown in the figure, the power supply voltage is constant, R = 50 ohms, to minimize the current, where should slide P? analysis and solution: by Ohm’s Law I = U / R