# ohm
## English
### 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”).

### Pronunciation

* (UK) IPA: /əʊm/
* (US) IPA: /oʊm/
* Audio (Southern England):(file)
* Audio (US):(file)
* Rhymes: -əʊm

### Noun

ohm (plural ohms)
* 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. Symbol: Ω
** 1900, Journal of the Franklin Institute, volume 149, page 461:If the volt, ampere and ohm were taken as the absolute units, the practical units would be the ampere, begohm and begavolt, names just as convenient as ampere, coulomb and farad.
** 1992, Chilton's General Motors, page 7:As the test light voltage touches terminal "C7", the module should switch, causing the ohmmeter to "overrange" if the meter is in the 1000-2000 ohms position.

#### Derived terms

* giga-ohm
* kilo-ohm
* mega-ohm
* micro-ohm
* milli-ohm
* nano-ohm
* pico-ohm
* tera-ohm

#### Translations
### Anagrams

* moh, HOM, Hom, hom., HMO, MHO, MOH, Moh., mho

## Czech
### Noun

ohm m inan
* ohm (unit of electrical resistance)

#### Declension
### Further reading

* “ohm”, in Příruční slovník jazyka českého (in Czech), 1935–1957
* “ohm”, in Slovník spisovného jazyka českého (in Czech), 1960–1971, 1989

## Dutch
### Pronunciation

* Audio:(file)

### Noun

ohm m (plural ohms, diminutive ohmpje n)
* ohm

## French
### Pronunciation

* IPA: /om/
* Audio:(file)
* Homophone: heaume (but aspirated h)

### Noun

ohm m (plural ohms)
* ohm

### Further reading

* “ohm”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

## Galician
### Noun

ohm m (plural ohns)
* ohm

## Norwegian Nynorsk
### Etymology

Named after Bavarian physicist Georg Ohm.

### Pronunciation

* IPA: /uːm/
* Homophones: om, óm

### Noun

ohm m (definite singular ohmen, indefinite plural ohm, definite plural ohmane)
* ohm

### References

* “ohm” in The Nynorsk Dictionary.

### Anagrams

* hom

## Polish
### Alternative forms

* om

### Etymology

Named after the German physicist Georg Ohm.

### Pronunciation

* IPA: /ˈɔm/
* Rhymes: -ɔm
* Syllabification: ohm

### Noun

ohm m inan
* (uncommon) ohm

#### Declension
### Further reading

* ohm in Polish dictionaries at PWN

## Portuguese
### Etymology

Named after Bavarian physicist Georg Ohm. See German Ohm.

### Pronunciation

* (Brazil) IPA: /ˈõ/
* (Portugal) IPA: /ˈõ/
* Hyphenation: ohm

### Noun

ohm m (plural ohms)
* ohm (the derived unit of electrical resistance)

## Romanian
### Etymology

Borrowed from French ohm.

### Noun

ohm m (plural ohmi)
* ohm

#### Declension
## Spanish
### Pronunciation

* IPA: /ˈom/ [ˈõm]
* Rhymes: -om
* Syllabification: ohm

### Noun

ohm m (plural ohms)
* Alternative form of ohmio

### Further reading

* “ohm”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10

## Swedish
### Etymology

From Georg Simon Ohm (1789–1854), attested since 1882.

### Noun

ohm c
* ohm, Ω
** 1883, Gustaf Robert Dahlander, “Uppmätning af potentialskilnaden mellan två punkter”, in Elektriciteten och dess förnämsta tekniska tillämpningar‎, page 57:Däremot har det för svagare strömmar afsedda instrumentet 100 ohms motstånd, […]On the other hand, the instrument for weaker currents has a resistance of 100 ohms, […]

#### Derived terms

* 150-ohmare (“punsch-roll”)
* attoohm
* centiohm
* deciohm
* dekaohm
* exaohm
* femtoohm
* gigaohm
* hektoohm
* kiloohm
* megaohm
* mikroohm
* milliohm
* nanoohm
* ohmmeter
* ohmmeter (“ohmmeter”)
* petaohm
* pikoohm
* teraohm
* yoktoohm
* yottaohm
* zeptoohm
* zettaohm

### See also

* impedans (“impedance”)
* Ohms lag (“Ohm's law”)
* reaktans (“reactance”)
* resistans (“resistance”)

### References

* ohm in Svensk ordbok (SO)
* ohm in Svenska Akademiens ordbok (SAOB)