# coulomb

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## coulomb

(ko͞o`lŏm) [for C. A. de CoulombCoulomb, Charles Augustin de
, 1736–1806, French physicist. In 1789 he retired from his posts as military engineer and as superintendent of waters and fountains and devoted himself to continuing his scientific research.
], abbr. coul or C, unit of electric chargecharge,
property of matter that gives rise to all electrical phenomena (see electricity). The basic unit of charge, usually denoted by e, is that on the proton or the electron; that on the proton is designated as positive (+e
. The absolute coulomb, the current U.S. legal standard, is the amount of charge transferred in 1 second by a current of 1 ampereampere
, abbr. amp or A, basic unit of electric current. It is the fundamental electrical unit used with the mks system of units of the metric system. The ampere is officially defined as the current in a pair of equally long, parallel, straight wires 1 meter apart that produces
; i.e., it is 1 ampere-second.

## Coulomb

(1) A unit of the quantity of electricity (electric charge) in the International System of Units (SI). It was named in honor of the French physicist C. Coulomb. The abbreviations are k in Russian and C in the international system. One coulomb is the charge carried through the cross section of a conductor in 1 sec by a current of 1 ampere. The relationships between the coulomb and the units of charge in the cgs system of units are as follows: 1 C = 3 X 109 units of the cgs electrostatic (cgs esu) system; 1 C = 0.1 unit of the cgs electromagnetic (cgs emu) system.

(2) The unit of flux of electric displacement (the flux of electric induction) in the SI system of units: 1 C is the electric flux through a closed surface that contains a free charge of 1 C. The relationships between the coulomb and the unit of electric flux in the cgs system of units are as follows: 1 C ≃ 4π X 3 X 109 units of the cgs esu system; 1 C = 0.4π units of the cgs emu system.

## coulomb

[′kü‚läm]
(electricity)
A unit of electric charge, defined as the amount of electric charge that crosses a surface in 1 second when a steady current of 1 absolute ampere is flowing across the surface; this is the absolute coulomb and has been the legal standard of quantity of electricity since 1950; the previous standard was the international coulomb, equal to 0.999835 absolute coulomb. Abbreviated coul. Symbolized C.

## coulomb

the derived SI unit of electric charge; the quantity of electricity transported in one second by a current of 1 ampere.

## Coulomb

Charles Augustin de . 1736--1806, French physicist: made many discoveries in the field of electricity and magnetism

## coulomb

A standard unit of electrical charge. Pronounced "kool-ahm," one coulomb (C) is equivalent to one amp of current flowing through a conductor for one second. It is also equal to 6.25 quintillion electrons (6.25 X 10 to the 18th). From French physicist Charles de Coulomb (1736-1806), who measured the behavior of electrical charges. See capacitance.
References in periodicals archive ?
Columb said: "They have to realise that you cannot come here for the big prize-money, have a week's holiday, and ride one or two horses and go home with a smile on your face and a big cheque in your pocket but do what you like on the track to get it.
Smith was jailed for 18 months and Columb for 15 months.
Columb pleaded guilty to burglary at Merthyr Crown Court in February, and was jailed last week for a total of four-and-a-half years.
With 100,000 people visiting the Walls and St Columb s Cathedral each year, this location has obvious tourism potential which has not been fully exploited.
Donations can be made to: The Katrina Pethick Fund, c/o Lloyds Bank, Columb Major, Cornwall (sort code 30-96-03, account number 77126630).
Longford's net minder Paddy Columb was called into action in the 15th minute.
Unlike Al-Qaeda, the ISIL has not been dependent on money from foreign donors, to avoid leaving it vulnerable to their influence," Business Wire wrote, citing Columb Strack, senior analyst at IHS, and lead analyst for the IHS Conflict Monitor.
Contract Awarded for Install photovoltaic (PV) systems, which generate electricity from solar energy, at their head office in St Austell, their Cornwall distribution centre in St Columb and at the County Arms in Truro.
Global Banking News-September 11, 2014--Barclays to close branch in St Columb Major
Among the local talent performing are Duplex Urban EDM Duo - two boys from Coventry, Columb Flinn and Jasraj Sahota.

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