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
- 1969: J.C. Anderson, D.M. Hum, B.G. Neal and J.H. Whitelaw: Data and Formulae for Engineering Students (2nd ed.) ... (previous) ... (next): $1.$ Units and Abbreviations: $1.2$ SI units $(2)$ Derived units
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): henry
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): henry