Electrical resistance

A measure of how much a given device restricts the flow of electric current.

The resistance (R) of an object is defined as the ratio of voltage across it to current through it: R = V / I.

SI unit symbol: Ohm, Ω

To quickly determine the electrical resistance of a specific wire use our online Wire Resistance Calculator.

Learn more about Ohm's Law.


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08/09/1776
date of birth
Avogadro, Amedeo

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