Definition:Ohm (Unit)

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The ohm is the SI unit of electrical resistance.

It is defined as being the electrical resistance between two points of an electrical conductor when a constant electric potential of $1$ volt, applied to these points, produces in the conductor an electric current of $1$ ampere, the conductor not being the seat of any electromotive force.



The symbol for the ohm is $\Omega$.

Its $\LaTeX$ code is \Omega .

Base Units

The SI base units of the ohm are:

$\mathrm W := \mathrm {kg} \, \mathrm m^2 \mathrm s^{-3} \mathrm A^{-2}$


$\mathrm {kg}$ denotes kilograms
$\mathrm m$ denotes metres
$\mathrm s$ denotes seconds (of time).
$\mathrm A$ denotes ampere.

Source of Name

This entry was named for Georg Simon Ohm.