See also: Coulomb (homonymy)
The Coulomb (symbol: C ) is the electric unit of Charge in the international Système (IF). It is a derived unit.
Its name comes from the name of the physicist French Charles of Coulomb.
It is the quantity of electricity crossing a section of a driver traversed by a running of intensity of 1 amp during 1 second (1 C = 1 S. has).
Elementary charge
The Elementary charge | E | . The electron charge. is worth -| E |, that of the proton +| E |.
Other units of load
It replaced the unit Franklin (noted Fr ), of the name of the American physicist Benjamin Franklin. This unit was of use in the system CGS.
- 1 was worth 0,3336 C.
- Franklin
One also uses, in electrochemistry, the faraday (noted F ), of the name of the physicist English Michael Faraday. It is the product of the Elementary charge by the Nombre of Avogadro.
- 1 faraday is worth 96 485 C and represent the load associated with a mole with electron S (in absolute value). (note: the farad is a unit of capacity associated with a condenser to see the corresponding article)
In technology, one also uses a larger unit the Ampère-heure (A.h).
- 1 A.h = 3600 C
Orders of magnitude
According to the law of Coulomb, two loadings concentrated each one of Coulomb and separated from a Mètre in the vacuum exert one on the other a force of 9 NR, i.e. roughly the Poids of an object of nine hundred and thousand ton S (900 000t). Coulomb is thus a unit too much large to express the quantities of static head and one generally uses his submultiple S such as the millicoulomb (mC), the microcoulomb (μC) or the nanocoulomb (nC).
See too
- Electrostatic
Simple: Coulomb
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