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欧姆定律是初中物理电学中最重要的定律之一,教材中欧姆定律的研究是从实验开始的,经过对实验结果的分析、归纳得出规律:导体中的电流与导体两端的电压成正比,与导体的电阻成反比.欧姆定律只适用于纯电阻电路,即电能全部转化为内能的电路,如:电阻、白炽灯、电炉、电热器等等,而电动机正常工作时,就不是纯电阻电路.欧姆定律的数学表达式是I=U/R,I的单位是安(A),U的单位是伏(V),R的单位是欧(Ω).电
Ohm’s law is one of the most important laws in physics of junior middle school. The study of Ohm’s law in textbooks starts from the experiment. After analyzing the experimental results, the law is deduced that the current in the conductor is proportional to the voltage across the conductor, Is inversely proportional to the resistance of the conductor.Ohm’s law is only applicable to purely resistive circuits, that is, circuits that completely convert electrical energy into internal energy, such as resistors, incandescent lamps, electric furnaces, electric heaters, etc. When the motor is in normal operation, Circuit The mathematical expression of Ohm’s Law is I = U / R, I is in amperes (A), U is in volts (V), and R is in ohms