Inductance Converter
Henry (H)
Definition: The henry (symbol: H) is the SI derived unit of electrical inductance. It is defined as the inductance of a closed circuit in which an electromotive force of one volt is produced when the electric current in the circuit varies uniformly at a rate of one ampere per second.
History/origin: Named in honor of Joseph Henry (1797–1878), who discovered electromagnetic induction around the same time as Michael Faraday. It was officially adopted by the International Electrotechnical Commission in 1893.
Current use: The Henry is used to specify the inductance of large coils, power transformers, and heavy industrial inductors.
Millihenry (mH)
Definition: A millihenry is a submultiple of the henry, equal to one-thousandth (1/1,000) of a henry.
History/origin: As electronics shrank from massive machinery to tabletop devices, the millihenry became a more practical unit for everyday engineering tasks.
Current use: Commonly used to measure audio-frequency inductors, filters in power supplies, and ignition coils in vehicles.
Henry (H) to Millihenry (mH) Conversion Table
| Henry (H) [h] | Millihenry (mH) [mh] |
|---|---|
| 0.01 h | 10 mh |
| 0.1 h | 100 mh |
| 1 h | 1000 mh |
| 2 h | 2000 mh |
| 3 h | 3000 mh |
| 5 h | 5000 mh |
| 10 h | 10000 mh |
| 20 h | 20000 mh |
| 50 h | 50000 mh |
| 100 h | 100000 mh |
| 1000 h | 1000000 mh |
How to Convert Henry (H) to Millihenry (mH)
1 h = 1000 mh
1 mh = 0.001 h
Example: convert 15 h to mh:
15 h = 15 × 1000 mh = 15000 mh
Did You Know?
- Did you know? The unit "Henry" is named after Joseph Henry, an American scientist who discovered self-inductance independently of Michael Faraday around the same time!
- Millihenries (mH) are commonly found in the crossover networks of loudspeakers. They help direct the right sound frequencies to the woofer and tweeter.