# ohm

[ohm] /oʊm/
noun
1.
the standard unit of electrical resistance in the International System of Units (SI), formally defined to be the electrical resistance between two points of a conductor when a constant potential difference applied between these points produces in this conductor a current of one ampere. The resistance in ohms is numerically equal to the magnitude of the potential difference. Symbol: Ω.
Origin of ohm
1861
1861; named after G. S. Ohm
Related forms
ohmic
[oh-mik] /ˈoʊ mɪk/ (Show IPA),

## O.H.M.S.

1.
On His Majesty's Service; On Her Majesty's Service.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for ohms
Historical Examples
• The total metallic resistance of the circuit should not be less than 10 ohms.

• The separate resistances of two incandescent lamps are 200 ohms and 70 ohms.

Willis Eugene Tower
• This result, times the ohms Page 162 per cubic inch, as given in the table, gives the resistance of the winding.

Kempster Miller
• It has a resistance of 5000 ohms with a mid-tap at 2500 ohms as shown at C.

A. Frederick Collins
• There remains now only to determine the resistance in ohms which the body offers to the passage of the current.

• Notice that I told the number of ohms and the number of volts, what are you going to tell?

John Mills
• No. 32, however, is very nearly of that resistance and if wound to exactly the same depth would give about 970 ohms.

Kempster Miller
• If it has a million ohms we say it has a “megohm” of resistance.

John Mills
• A pair of magnets of about 50 ohms are mounted on this support.

Various
• The introduction of a chemical reagent reduced it to 19,000 ohms.

British Dictionary definitions for ohms

## OHMS

abbreviation (in Britain and the dominions of the Commonwealth)
1.
On Her (or His) Majesty's Service

## ohm

/əʊm/
noun
1.
the derived SI unit of electrical resistance; the resistance between two points on a conductor when a constant potential difference of 1 volt between them produces a current of 1 ampere Ω
Word Origin
C19: named after Georg Simon Ohm

## Ohm

/əʊm/
noun
1.
Georg Simon (ˈɡeːɔrk ˈziːmɔn). 1787–1854, German physicist, who formulated the law named after him
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ohms

## ohm

n.

unit of electrical resistance, 1867, in recognition of German physicist Georg S. Ohm (1789-1854), who determined the law of the flow of electricity. Originally proposed as ohma (1861) as a unit of voltage. Related: ohmage; ohmic; ohmeter.

Online Etymology Dictionary, © 2010 Douglas Harper
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ohms in Medicine

ohm (ōm)
n.
Symbol Ω
A unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals.

The American Heritage® Stedman's Medical Dictionary
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ohms in Science
 ohm   (ōm)    The SI derived unit used to measure the electrical resistance of a material or an electrical device. One ohm is equal to the resistance of a conductor through which a current of one ampere flows when a potential difference of one volt is applied to it.
The American Heritage® Science Dictionary
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ohms in Culture
ohm [(ohm)]

The unit of electrical resistance, named after the nineteenth-century German physicist Georg Ohm.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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Related Abbreviations for ohms

### OHMS

On Her (or His) Majesty's Service
The American Heritage® Abbreviations Dictionary, Third Edition
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### Difficulty index for ohm

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### Word Value for ohms

9
9
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