Gaois

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4 results

  1. INDUSTRY|electronics and electrical engineering|electrical engineering

    #626521

    IATE #1365688
    róvoltas Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    Überspannung
    de
    overvoltage
    en
    Definition any voltage between one phase conductor and earth or between phase conductors having a peak value exceeding the corresponding peak of the highest voltage for equipment Reference "IEV 604-03-09, http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=604-03-09 [14.10.2013]"
    surtension | excès de tension
    fr
    Definition toute tension entre un conducteur de phase et la terre ou entre deux conducteurs de phase dont la ou les valeurs de crête dépassent la valeur de crête correspondant à la tension la plus élevée pour le matériel ;tension anormale entre deux points d'une installation électrique supérieure à la valeur la plus élevée pouvant exister entre eux en service normal Reference VEI 604-3-9 ;Lex.ferrov.
  2. INDUSTRY|chemistry

    #626726

    IATE #1369777
    róphoitéinseal Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    Überspannung
    de
    Definition Unterschied im Elektrodenpotential zwischen einer strombelasteten und einer gleichen unbelasteten Elektrode, die mit ihrem Elektrolyten im Gleichgewicht steht; meist angegeben in mV. Man unterscheidet folgende Typen der Ueberspannung a) Konzentrationsueberspannung, bedingt durch den bei Strombelastung eintretenden Komzentrationunterschied zwischen der ElektrolytschiCht direkt an der ElektrodenOberflaeche-dem Elektrodenfilm und der Hauptmasse des Elektrolyten b) Widerstandueberspannung, bedingt durch den Widerstand des elektrodenfilms; sie ist im gemessenen Wert der Ueberspannung enthalten c) Aktivierungsueberspannung, bedingt durch Hemmungen in der Elektrodenreaktion. Wenn eine Elektrode bei gegebener Stromdichte Sitz einer bestimmten einfachen Elektrodenreaktion ist, so ist die Ueberspannung dieser Reaktion an dieser Elektrode in einem gegebenen Augenblick gleich der Elektrodenspannung die dieser Reaktion entspricht. Verschiebung eines Elektrodenpotentials aus dem (reversiblen) Gleichgewichtswert infolge von Stromfluss Reference DECHEMA
    overpotential
    en
    Definition the difference in the electrode potential of an electrode between its equilibrium potential and its operating potential when a current is flowing Reference "Corrosion Doctors. Electrochemistry Dictionary, http://corrosion-doctors.org/Dictionary/Dictionary-O.htm [14.10.2013]"
    Comment "The overpotential represents the extra energy needed (an energy loss that appears as heat) to force the electrode reaction to proceed at a required rate (or its equivalent current density). Consequently, the operating potential of an anode is always more positive than its equilibrium potential, while the operating potential of a cathode is always more negative than its equilibrium potential. The overpotential increases with increasing current density, see Tafel equation. The value of the overpotential also depends on the ""inherent speed"" of the electrode reaction: a slow reaction (with small exchange current density) will require a larger overpotential for a given current density than a fast reaction (with large exchange current density). Also referred to as ""polarization"" of the electrode. See also overvoltage. An electrode reaction always occurs in more than one elementary step, and there is an overpotential associated with each step. Even for the simplest case, the overpotential is the sum of the concentration overpotential and the activation overpotential.In electrochemistry, overvoltage is not a synonym of overpotential, although, unfortunately, the terms ""overvoltage"" and ""overpotential"" are sometimes used interchangeably."
    surtension
    fr
    Definition différence entre la tension dynamique d'une électrode et sa tension réversible pour une réaction électrochimique donnée Reference VEI 50-5-200
  3. INDUSTRY|electronics and electrical engineering|electrical engineering

    #626842

    IATE #1372906
    róvoltas Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    Überspannung
    de
    overvoltage | overtension
    en
    Definition voltage the value of which exceeds a specified limiting value Reference "IEV 151-15-27, http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=151-15-27 [14.10.2013]"
    surtension
    fr
    Definition tension dont la valeur dépasse la plus grande valeur assignée Reference VEI 151-3-19
  4. INDUSTRY|chemistry

    #627034

    IATE #1386327
    róvoltas ómach Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    róvoltas friotaíochta Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    Widerstandsüberspannung
    de
    Definition Überspannung, die auftritt, wenn die Geschwindigkeit der Elektrodenreaktion ausschließlich durch den Widerstand der elektrochemischen Doppelschicht bestimmt ist Reference DECHEMA
    Comment Die Widerstandsüberspannung beruht oft auf der Entstehung einer Schicht hohen Widerstandes auf der Elektrodenoberfläche
    solution ir drop | ohmic overpotential | polarization | ohmic overvoltage | resistance overpotential | resistance overvoltage
    en
    Definition "ir drop [ IATE:1369802 ] in the electrolyte solution of a three-electrode cell between the working and the reference electrodes" Reference "Corrosion Doctors. Electrochemistry Dictionary, http://corrosion-doctors.org/Dictionary/Dictionary-S.htm [14.10.2013]"
    Comment This ir drop (which is expressed as a potential) is always included in the measured potential of the working electrode. Therefore, it is important to minimize this error, and to place the reference electrode as close as possible to the working electrode (see Luggin tip). One can correct for the ir drop to obtain the real electrode potential, or in some cases one can compensate for the ir drop during potential control. During the measurement of an electromotive force (potential measurement without any current flowing), the ir drop is always zero, and the position of the reference electrode is immaterial.
    surtension de résistance | surtension ohmique
    fr
    Definition surtension provenant de la résistance que rencontre le flux d'ions en traversant l'électrolyte Reference "COM-FR, d'après: Compréhension par établissement de courbes d'étalonnage de la structure des membranes perfluorées sulfoniques pour pile à combustible, E. Moukheiber, 2006, http://tel.archives-ouvertes.fr/docs/00/87/30/25/PDF/manuscript_final.pdf [23.12.2013]"