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问：在研究电流跟电压、电阻的关系的实验中，为什么“先保持电阻不变，研究电流跟电压的关系”，再“保持电压不变，研究电流跟电阻的关系”？答：我们知道，一方面，电压使电路中形成了电流，导体两端有电压，导体中才有电流．另一方面，导体有电阻，导体对电流有阻碍作用．?
Question: In the experiment of studying the relationship between current, voltage, and resistance, why do we keep the resistance constant, study the relationship between current and voltage, and then keep the voltage constant and study the relationship between current and resistance? A: We know that, on the one hand, the voltage causes current to flow in the circuit, there is voltage across the conductor, and there is current in the conductor. On the other hand, the conductor has a resistance and the conductor has a hindrance to the current. ?