# ohm

> English word · Noun · IPA /əʊm/ · frequency rank #28,649

## Definitions
1. In the International System of Units, the derived unit of electrical resistance; the electrical resistance of a device across which a potential difference of one volt causes a current of one ampere.

## Etymology
Named after Bavarian physicist Georg Ohm. A German surname, first recorded in the 12th century, from German Ohm (“uncle”), from Proto-West Germanic *auhaim (“maternal uncle”), from or related to Proto-Germanic *awô (“grandfather, paternal uncle”) + *haimaz (“home”). Doublet of oom and of dialectal eam (“uncle”).

## Easily confused with
- **on** (https://plainspell.com/en/vs/ohm-vs-on)
- **or** (https://plainspell.com/en/vs/ohm-vs-or)
- **OK** (https://plainspell.com/en/vs/ohm-vs-ok)
- **op** (https://plainspell.com/en/vs/ohm-vs-op)
- **OS** (https://plainspell.com/en/vs/ohm-vs-os)
- **oz** (https://plainspell.com/en/vs/ohm-vs-oz)
- **OT** (https://plainspell.com/en/vs/ohm-vs-ot)
- **ou** (https://plainspell.com/en/vs/ohm-vs-ou)
- **oi** (https://plainspell.com/en/vs/ohm-vs-oi)
- **ow** (https://plainspell.com/en/vs/ohm-vs-ow)
- **oo** (https://plainspell.com/en/vs/ohm-vs-oo)
- **om** (https://plainspell.com/en/vs/ohm-vs-om)
- **ox** (https://plainspell.com/en/vs/ohm-vs-ox)
- **OJ** (https://plainspell.com/en/vs/ohm-vs-oj)
- **oy** (https://plainspell.com/en/vs/ohm-vs-oy)
- **ov** (https://plainspell.com/en/vs/ohm-vs-ov)
- **one** (https://plainspell.com/en/vs/ohm-vs-one)
- **out** (https://plainspell.com/en/vs/ohm-vs-out)
- **our** (https://plainspell.com/en/vs/ohm-vs-our)
- **old** (https://plainspell.com/en/vs/ohm-vs-old)

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ohm