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探究电流与电压的关系和电流与电阻的关系是揭示欧姆定律的实验基础.在探究电流与电阻关系的实验中,必须通过调节滑动变阻器控制定值电阻两端的电压保持不变.
Exploring the relationship between current and voltage and the relationship between current and resistance is the experimental basis for revealing Ohm’s law. In the experiment to investigate the relationship between current and resistance, the voltage across the setpoint resistor must be kept constant by adjusting the sliding rheostat.