98年武汉市中考物理压轴题的第3问(原题题干太长,这里略作删改).我们试用多种数学方法对此题作出解答.题目:某同学在做“测定小灯泡功率”的实验(如图所示)中,所用灯泡电阻 R_0为10欧,滑动变阻器的阻值范围为0～20欧,电源电压为4伏.(电源电压和灯丝电阻不变).在移动滑 In 1998, the third question of the physics scroll question in the Wuhan City Entrance Examination (the original question was too long, slightly modified here). We tried a variety of mathematics methods to answer this question. Title: Some students are doing " measuring light bulb power In the experiments (as shown in the figure), the bulb resistance R_0 is 10 ohms, the resistance of the sliding varistor is 0 to 20 ohms, and the power supply voltage is 4 volts (power supply voltage and filament resistance are constant). slip