ohm


ohm
   1. the SI unit of electric resistance, reactance, and impedance. If a conductor connects two locations having different electric potentials, then a current flows through the conductor. The amount of the current depends on the potential difference and also on the extent to which the conductor resists the flow of current. For direct current circuits, this property of opposition to current flow is called the resistance. In alternating current circuits, the current flow is also affected by reactive components, capacitors or inductors, that react to the change in the current over time. This opposition is called reactance; impedance measures the combined effect of resistance and reactance. All three quantities are measured in ohms. One ohm is the resistance, reactance, or impedance that requires a potential difference of one volt per ampere of current. The unit honors the German physicist Georg Simon Ohm (1787-1854). The capital Greek letter omega is used as the symbol for the ohm, since "O" would be easily misinterpreted as a zero.
   2. a traditional German unit of liquid volume, no longer in use. The ohm, spelled aume in English, was generally equal to 1/6 fuder or roughly 150 liters (40 U.S. gallons).

Dictionary of units of measurement. 2015.

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  • ohm — ohm …   Dictionnaire des rimes

  • ohm — [ om ] n. m. • 1867; nom d un physicien all. ♦ Métrol. Unité de mesure de résistance électrique (symb.Ω). L ohm, ses multiples et ses sous multiples (kilohm, mégohm, microhm...) sont conservés à l aide de résistances étalons faites de fil de… …   Encyclopédie Universelle

  • ohm — OHM, ohmi, s.m. Unitate de măsură a rezistenţei electrice, în sistemul de unităţi metru kilogram secundă amper, egală cu rezistenţa pe care o opune un conductor electric străbătut de un curent de un amper la tensiunea de un volt. [pr.: om] – Din… …   Dicționar Român

  • Ohm — /ohm/, n. Georg Simon, /gay awrddk zee mawn/ 1787 1854, German physicist. * * * ▪ unit of energy measurement       abbreviation Ω, unit of electrical resistance in the metre kilogram second system, named in honour of the 19th century German… …   Universalium

  • ohm — òhm s.m.inv. TS fis., elettr. nel Sistema Internazionale, unità di misura della resistenza elettrica (simb. Ω) {{line}} {{/line}} DATA: 1892. ETIMO: da Ohm, nome del fisico tedesco Georg Simon Ohm (1787 1854). POLIREMATICHE: ohm acustico: loc.s.m …   Dizionario italiano

  • Ohm —    , OHM S LAW    Georg Simon Ohm (1787 1854), was born in Erlangen, Bavaria, Germany, to a family of locksmiths.    Ohm received a doctorate in physics when he was twenty two and then accepted a position teaching mathematics at the Jesuit… …   Dictionary of eponyms

  • Ohm — ([=o]m), n. [So called from the German electrician, G. S. Ohm.] (Elec.) The standard unit in the measure of electrical resistance, being the resistance of a circuit in which a potential difference of one volt produces a current of one amp[ e]re.… …   The Collaborative International Dictionary of English

  • Ohm — Ohm, vorzugsweise ein Weinmaß, das aber in den meisten Ländern verschieden ist. In Hamburg z. B. rechnet man auf 1 Ohm 5 Eimer oder 80 Kannen, in Hannover 60 Kannen, eben so in Schweden, in Würtemberg 160 Maß, in Baden 100 Maß etc. Fast überall… …   Damen Conversations Lexikon

  • ohm — [əum US oum] n [Date: 1800 1900; Origin: Georg Simon Ohm (1787 1854), German scientist] a unit for measuring electrical ↑resistance …   Dictionary of contemporary English

  • 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 …   Etymology dictionary

  • ohm — (izg. ȏm) m DEFINICIJA izvedena SI jedinica električnog otpora (simbol Ω); otpor između dvije točke vodiča iznosi 1 Ω ako pod utjecajem potencijalne razlike (između tih točaka) od jednog volta vodičem teče struja od jednog ampera (Ω = V/A)… …   Hrvatski jezični portal


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