Ohm's law
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Ohm's law describes how voltage, current, and resistance are related in an electrical circuit: the current flowing through a resistor is directly proportional to the voltage applied across it. This relationship is fundamental to understanding and designing electrical circuits, since it allows engineers and technicians to predict how much current will flow when a specific voltage is applied.
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V, I, and R, the parameters of Ohm's law
Ohm's law states that the electric current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the three mathematical equations used to describe this relationship: