# Dictionary Definition

coulomb

### Noun

1 a unit of electrical charge equal to the amount
of charge transferred by a current of 1 ampere in 1 second [syn:
C, ampere-second]

2 French physicist famous for his discoveries in
the field of electricity and magnetism; formulated Coulomb's Law
(1736-1806) [syn:
Charles Augustin de Coulomb]

# User Contributed Dictionary

see Coulomb

## English

### Etymology

Named after the French physicist Charles-Augustin de Coulomb.### Noun

- In the
International System of Units, the derived unit
of electric
charge; the amount of electric charge carried by a current of 1 ampere flowing for 1 second. Symbol: C
- He is charged up with enough coulombs to make his hair stand on end.

#### Translations

## French

### Noun

coulomb- () coulomb

# Extensive Definition

The coulomb (symbol: C) is the SI unit of electric
charge. It is named after
Charles-Augustin de Coulomb.

## Definition

- 1 \ \mathrm = 1 \ \mathrm \cdot 1 \ \mathrm

It can also be expressed in terms of capacitance
and voltage, where one coulomb is equal to one farad of capacitance times one
volt of electric potential
difference:

- 1 \ \mathrm = 1 \ \mathrm \cdot 1 \ \mathrm

## Explanation

In principle, the coulomb could be defined in
terms of the charge of an electron or elementary
charge. Since the values of the Josephson
(CIPM (1988) Recommendation 1, PV 56; 19) and von
Klitzing (CIPM (1988), Recommendation 2, PV 56; 20) constants
have been given conventional values (KJ ≡ 4.835 979 Hz/V and RK ≡
2.581 280 7 Ω), it is possible to combine these
values to form an alternative (not yet official) definition of the
coulomb. A coulomb is then equal to exactly
6.241 509 629 152 65 elementary
charges. Combined with the present definition of the ampere, this proposed definition
would make the kilogram
a derived unit.

In everyday situations, positive and negative
charges are usually balanced out. According to Coulomb's
Law, two point
charges of +1 C, one meter apart, would experience a
repulsive force of 9 N,
roughly the equivalent of 900,000 metric tons of weight.

## Historical note

The ampere was historically a derived
unit—being defined as 1 coulomb per second. Therefore the coulomb,
rather than the ampere, was the SI base electrical unit.

In 1960 the SI system made the ampere the base
unit.

## SI multiples

## Conversions

- The electrical charge of one mole of electrons (approximately 6.022, or Avogadro's number) is known as a faraday (actually –1 faraday, since electrons are negatively charged). One faraday equals 96.485 341 5 kC (the Faraday constant). In terms of Avogadro's number (NA), one coulomb is equal to approximately 1.036 × NA elementary charges.

- one ampere-hour = 3600 C

- The elementary charge is 1.602176487 C

- One statcoulomb (statC), the CGS electrostatic unit of charge (esu), is approximately 3.3356 C or about 1/3 nC.

- 1 coulomb is the amount of electrical charge in 6.241506 electrons or other elementary charged particles.

## See also

- Abcoulomb, a cgs unit of charge
- Statcoulomb, a cgs unit of charge
- Faraday, an obsolete unit
- Coulomb's law
- Current (electricity)
- Faraday constant
- Quantity of electricity
- SI
- Ampere
- Ampère's circuital law
- Farad

## References

coulomb in Arabic: كولوم

coulomb in Asturian: Culombiu

coulomb in Bengali: কুলম্ব

coulomb in Belarusian: Кулон

coulomb in Belarusian (Tarashkevitsa):
Кулон

coulomb in Bosnian: Kulon

coulomb in Breton: Coulomb

coulomb in Bulgarian: Кулон

coulomb in Catalan: Coulomb

coulomb in Czech: Coulomb

coulomb in Danish: Coulomb

coulomb in German: Coulomb

coulomb in Modern Greek (1453-): Κουλόμπ (μονάδα
μέτρησης)

coulomb in Spanish: Culombio

coulomb in Esperanto: Kulombo

coulomb in Basque: Coulomb

coulomb in French: Coulomb

coulomb in Galician: Coulomb

coulomb in Korean: 쿨롱

coulomb in Hindi: कूलम्ब

coulomb in Croatian: Kulon

coulomb in Indonesian: Coulomb

coulomb in Icelandic: Kúlomb

coulomb in Italian: Coulomb

coulomb in Hebrew: קולון

coulomb in Kurdish: Coulomb

coulomb in Lithuanian: Kulonas

coulomb in Hungarian: Coulomb

coulomb in Dutch: Coulomb (eenheid)

coulomb in Japanese: クーロン

coulomb in Norwegian: Coulomb

coulomb in Norwegian Nynorsk: Coulomb

coulomb in Polish: Kulomb

coulomb in Portuguese: Coulomb

coulomb in Romanian: Coulomb (unitate)

coulomb in Russian: Кулон

coulomb in Simple English: Coulomb

coulomb in Slovak: Coulomb

coulomb in Slovenian: Coulomb

coulomb in Serbian: Кулон (јединица)

coulomb in Serbo-Croatian: Kulon

coulomb in Finnish: Coulombi

coulomb in Swedish: Coulomb

coulomb in Vietnamese: Coulomb (đơn vị)

coulomb in Turkish: Coulomb (birim)

coulomb in Ukrainian: Кулон (одиниця СІ)

coulomb in Chinese: 库仑