Ohm's law ōm [key] [for G. S. Ohm ], law stating that the electric current i flowing through a given resistance r is equal to the applied voltage v divided by the resistance, or i = v / r. For general application to alternating-current circuits where inductances and capacitances as well as resistances may be present, the law must be amended to i = v / z, where z is impedance . There are conductors in which the current that flows is not proportional to the applied voltage. These do not follow this law and are called nonohmic conductors.
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