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学习了欧姆定律后,老师布置了一个任务,让同学们自己动手测量一个导体的电阻。小明、小亮和小伟他们三个人来到了实验室,各自选择了待测电阻。然后,他们按照如图1所示的电路图连接好电路,并进行测量。移动滑动变阻器滑片,读出三次电压表和电流表的示数,并由此计算出每次的电阻和电阻的平均值。小亮说:“我不用电压表也能测出电阻。”然后说出了自己的设计思路:只有电流表,没有电压表时,可将电流表和定值电阻组合起
After studying Ohm’s law, the teacher arranged a task for the students to measure the resistance of a conductor by themselves. Xiao Ming, Xiao Liang, and Xiao Wei the three of them came to the lab and each chose the resistance to be measured. Then, they connected the circuit according to the circuit diagram shown in Figure 1, and measured. The sliding varistor slider is moved, the readings of the voltmeter and the ammeter are read out three times, and the average of the resistance and the resistance is calculated each time. Xiaoliang said: “I can measure the resistance without using a voltmeter.” Then I wrote my own design idea: Only the ammeter and the voltmeter can be combined with the ammeter and the fixed value resistor.