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Ohmís Law
Last modified: Tuesday, June 10, 2003 

A mathematical equation that shows the relationship between electric voltage, current and resistance. Ohmís Law was named after Bavarian mathematician and physicist Georg Ohm.

Ohmís 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
Knowing any two of the values of a circuit, one can determine the third using Ohmís Law. For example, if a circuit has a current of 2 amperes, and a resistance of 1 ohm, then according to Ohms Law, voltage equals 2 (V = 2 x 1).

Typically, Ohmís Law is only applied to DC circuits and not AC circuits.

Note well: The letter ďEĒ is sometimes used in representations of Ohmís Law for voltage instead of ďV.Ē

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Ohmís Law Calculator
A calculator to determine the missing value in an electronic circuit.

related categories

Electronic Technology

Measurement

related terms

amperage

ohm


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