The henry (symbol: H) is the SI unit of inductance. It is named after the American scientist Joseph Henry.
Definition
If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one henry inductance volt, then the inductance of the circuit is one henry.
1 H = Wb/A = 1 m2·kg·s–2·A–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 |
Explanation
The primary property of electronic components known as inductors is measured in henries.
See also
- Impedance
SI electricity units
| SI electromagnetic units edit | |||
|---|---|---|---|
| Quantity | Name | Symbol | Dimensions |
| Current | ampere (SI base unit) | A | A |
| Electric charge, Quantity of electricity | coulomb | C | A·s |
| Potential difference | volt | V | J/C = kg·m2·s−3·A−1 |
| Resistance, Impedance, Reactance | ohm | Ω | V/A = kg·m2·s−3·A−2 |
| Resistivity | ohm metre | Ω·m | kg·m3·s−3·A−2 |
| Electrical power | watt | W | V·A = kg·m2·s−3 |
| Capacitance | farad | F | C/V = kg−1·m−2·A2·s4 |
| Elastance | reciprocal farad | F−1 | kg·m2·A−2·s−4 |
| Permittivity | farad per metre | F/m | kg−1·m−3·A2·s4 |
| Conductance, Admittance, Susceptance | siemens | S | Ω−1 = kg−1·m−2·s3·A2 |
| Conductivity | siemens per metre | S/m | kg−1·m−3·s3·A2 |
| Magnetic flux | weber | Wb | V·s = kg·m2·s−2·A−1 |
| Magnetic flux density | tesla | T | Wb/m2 = kg·s−2·A−1 |
| Magnetic induction | ampere per metre | A/m | A·m−1 |
| Reluctance | ampere-turns per weber | A/Wb | kg−1·m−2·s2·A2 |
| Inductance | henry | H | Wb/A = V·s/A = kg·m2·s−2·A−2 |
| Permeability | henry per metre | H/m | kg·m·s−2·A−2 |
| Magnetic susceptibility | (dimensionless) | χ | - |
Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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