欧姆定律是德国物理学家欧姆在1826年提出的关于电路的实验定律:在稳恒条件下,通过一段导体的电流强度与导体两端的电压成正比,即I∞U或I=U/R,式中R称为导体电阻。欧姆还总结出关于电阻大小和性质的两条实验定律:一是电阻定律R=(ρL)/S;二是电阻与温度在高温条件下呈线性关系R= Ohm’s law is the experimental law of the circuit proposed by the German physicist Ohm in 1826: under steady conditions, the current intensity passing through a conductor is proportional to the voltage across the conductor, that is, I∞U or I = U / R, Where R is called the conductor resistance. Ohm also summed up the two experimental laws on the size and nature of the resistance: First, the resistance law R = (ρL) / S; Second, the resistance and temperature at a high temperature linear relationship R =