Definition:Henry (Unit)

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Definition

The henry is the SI unit of inductance.


It is defined as being the amount of inductance of a closed circuit that produces $1$ weber of magnetic flux per ampere:

$1 \ \mathrm H = 1 \ \mathrm {Wb} \, \mathrm A^{-1}$


Symbol

$\mathrm H$

The symbol for the henry is $\mathrm H$.


Its $\LaTeX$ code is \mathrm H .


Base Units

The SI base units of the henry are:

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

where:

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

This arises from its definition as $\mathrm {Wb} \, \mathrm A^{-1}$, that is: webers per ampere.


Source of Name

This entry was named for Joseph Henry.


Sources