Henry (inductance)
The henry (symbol: H) is the SI unit of inductance. It is named after the American scientist Joseph Henry.
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Definition
If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry.
H = Wb/A = m²·kg·s–2·A–2 = V·s/A = m²·kg·C–2
SI multiples
| Multiple | Name | Symbol | Multiple | Name | Symbol | |
|---|---|---|---|---|---|---|
| 100 | henry | H | ||||
| 101 | decahenry | daH | 10–1 | decihenry | dH | |
| 102 | hectohenry | hH | 10–2 | centihenry | cH | |
| 103 | kilohenry | kH | 10–3 | millihenry | mH | |
| 106 | megahenry | MH | 10–6 | microhenry | µH | |
| 109 | gigahenry | GH | 10–9 | nanohenry | nH | |
| 1012 | terahenry | TH | 10–12 | picohenry | pH | |
| 1015 | petahenry | PH | 10–15 | femtohenry | fH | |
| 1018 | exahenry | EH | 10–18 | attohenry | aH | |
| 1021 | zettahenry | ZH | 10–21 | zeptohenry | zH | |
| 1024 | yottahenry | YH | 10–24 | yoctohenry | yH |
 | This SI unit is named after Joseph Henry. As for all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (H). But when an SI unit is spelled out, it should always be written in lowercase (henry), unless it begins a sentence or is the name "degree Celsius". — Based on The International System of Units, section 5.2. |
See also
Categories
SI derived units | Units of electrical inductance