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例题 用一个电压保持不变的电源、一个电流表、一个开关、一个最大阻值为R_0的滑动变阻器和几根导线,试设法测出未知电阻R_x的值,写出实验步骤。 分析与解 本题是伏安法测电阻的变形,由于题中只给出一个电流表,所以在测量时应充分利用电流表测出多个电流数据,再根据欧姆定律与串、并联电路的特
Example Use a power supply with a constant voltage, an ammeter, a switch, a sliding rheostat with a maximum resistance of R_0, and several wires. Try to measure the value of the unknown resistor R_x and write down the test procedure. Analysis and solution The problem is the measurement of the resistance of the volt-ampere method. Since only one ammeter is given in the problem, multiple current data should be measured using the ammeter during measurement, and then according to Ohm’s law and the string and parallel circuit.