overvoltagen.

Brit.

/ˈəʊvəˌvəʊltɪdʒ/,

/ˈəʊvəˌvɒltɪdʒ/, U.S.

/ˈoʊvərˌvoʊltɪdʒ/

Origin: Formed within English, by derivation. Etymons: over- prefix, voltage n.²

Etymology: < over- prefix + voltage n.² Compare German Überspannung (W. A. Caspari 1899, in Zeitschr. f. Physikal. Chem. 30 91).

1. Chemistry. The extra potential above the value for theoretical, reversible conditions which must be applied to an electrolytic cell to liberate a substance at an electrode in practical, irreversible conditions.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > voltage > electrical potential > [noun] > measurement of > electrode > function of

overvoltage1907

overpotential1920

1907 W. R. Whitney tr. M. Le Blanc Elem. Electrochem. viii. 299 Not only in the case of hydrogen, but also in that of oxygen, an over-voltage which varies with the nature of the electrode..is produced by the separation of the gas.

1922 R. Glazebrook Dict. Appl. Physics II. 60/1 Platinised platinum as a cathode has the lowest overvoltage among the elements commonly available.

1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xi. 421 Using a mercury electrode the over-voltage of hydrogen is so great that the sodium is discharged and taken into the mercury as an amalgam.

1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) iii. 100 In the absence of overvoltage (a certain lack of reversibility at certain metal surfaces), hydrogen is liberated from pure water by reagents whose electrode potentials are more negative than −0.414 v.

2. A voltage in excess of some threshold value, or of that which is normal, safe, or allowed for.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > voltage > [noun] > higher than usual voltage

high voltage1888

supervoltage1898

overload1904

breakdown voltage1915

overvoltage1921

1921 S. Q. Hayes Switching Equipm. for Power Control v. 157 Relays are built to furnish protection on A.C. or D.C. circuits against overvoltage, no voltage, overload, no load, reverse load and reverse phase.

1963 B. Fozard Instrumentation Nucl. Reactors v. 56 Sometimes..a tube must be used with an insensitive scaling equipment, in which case a high overvoltage may be necessary to give satisfactory operation.

1991 Power 15 Sept. (advt.) The use of laser-cut aluminum foil and unique solderless internal construction dramatically improves overvoltage performance.

This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).

单词	overvoltage
释义	overvoltagen. Brit. /ˈəʊvəˌvəʊltɪdʒ/, /ˈəʊvəˌvɒltɪdʒ/, U.S. /ˈoʊvərˌvoʊltɪdʒ/ Origin: Formed within English, by derivation. Etymons: over- prefix, voltage n.² Etymology: < over- prefix + voltage n.² Compare German Überspannung (W. A. Caspari 1899, in Zeitschr. f. Physikal. Chem. 30 91). 1. Chemistry. The extra potential above the value for theoretical, reversible conditions which must be applied to an electrolytic cell to liberate a substance at an electrode in practical, irreversible conditions. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > voltage > electrical potential > [noun] > measurement of > electrode > function of overvoltage1907 overpotential1920 1907 W. R. Whitney tr. M. Le Blanc Elem. Electrochem. viii. 299 Not only in the case of hydrogen, but also in that of oxygen, an over-voltage which varies with the nature of the electrode..is produced by the separation of the gas. 1922 R. Glazebrook Dict. Appl. Physics II. 60/1 Platinised platinum as a cathode has the lowest overvoltage among the elements commonly available. 1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xi. 421 Using a mercury electrode the over-voltage of hydrogen is so great that the sodium is discharged and taken into the mercury as an amalgam. 1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) iii. 100 In the absence of overvoltage (a certain lack of reversibility at certain metal surfaces), hydrogen is liberated from pure water by reagents whose electrode potentials are more negative than −0.414 v. 2. A voltage in excess of some threshold value, or of that which is normal, safe, or allowed for. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > voltage > [noun] > higher than usual voltage high voltage1888 supervoltage1898 overload1904 breakdown voltage1915 overvoltage1921 1921 S. Q. Hayes Switching Equipm. for Power Control v. 157 Relays are built to furnish protection on A.C. or D.C. circuits against overvoltage, no voltage, overload, no load, reverse load and reverse phase. 1963 B. Fozard Instrumentation Nucl. Reactors v. 56 Sometimes..a tube must be used with an insensitive scaling equipment, in which case a high overvoltage may be necessary to give satisfactory operation. 1991 Power 15 Sept. (advt.) The use of laser-cut aluminum foil and unique solderless internal construction dramatically improves overvoltage performance. This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022). < n.1907
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