Ohm


Ohm
/ohm/, n.
Georg Simon, /gay awrddk" zee"mawn/ 1787-1854, German physicist.

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▪ unit of energy measurement
      abbreviation Ω, unit of electrical resistance in the metre-kilogram-second system, named in honour of the 19th-century German physicist Georg Simon Ohm (Ohm, Georg Simon). It is equal to the resistance of a circuit in which a potential difference of one volt produces a current of one ampere (1Ω = 1 V/A); or, the resistance in which one watt of power is dissipated when one ampere flows through it. Ohm's law (q.v.) states that resistance equals the ratio of the potential difference to current, and the ohm, volt, and ampere are the respective fundamental units used universally for expressing quantities.

      Impedance (electrical impedance), the apparent resistance to an alternating current, and reactance, the part of impedance resulting from capacitance or inductance, are circuit characteristics that are measured in ohms. The acoustic ohm and the mechanical ohm are analogous units sometimes used in the study of acoustic and mechanical systems, respectively.

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Universalium. 2010.

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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 — 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