# Ohm's Law

A mathematical equation that shows the relationship between electric voltage, current and resistance. Ohm��s Law was named after Bavarian mathematician and physicist Georg Ohm.Ohm��s Law can be stated as three mathematical equations, all derived from the same principle. In the following equations, V is voltage measured in volts, I is current measured in amperes and R is resistance measured in ohms:

- V = I x R
- R = V / I
- I = V / R

Typically, Ohm��s Law is only applied to DC circuits and not AC circuits.

**Note well:** The letter "E" is sometimes used in representations of Ohm��s Law for voltage instead of "V."

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