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Coulomb

The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb (1736 to 1806).

Table of contents
1 Definition
2 Explanation
3 Conversions
4 SI electricity units
5 See also

Definition

1 coulomb is the amount of electric charge carried by a current of 1 ampere flowing for 1 second.

1 C = 1s·A

Explanation

The coulomb is also the unit of electric flux. (See Gauss Law).

The coulomb could in principle 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 ≡ 4.835 979×1014 Hz/V and RK ≡ 2.5812807×104 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 6.24150962915265×1018 elementary charges. Combined with the current definition of the ampere, this proposed definition would make the kilogram a derived unit.

Conversions

  • One mole of electrons (approximately 6.022×1023, or Avogadro's number) is known as a faraday (actually -1 faraday, since electrons are negatively charged). One faraday equals 96.4853415 kC (the Faraday constant). In terms of Avogadro's number (NA), one coulomb is equal to approximately 1.036 × NA × 10−5 elementary charges.
  • one ampere-hour = 3600 C
  • The elementary charge is approximately 160.2176 zC.
  • One statcoulomb (statC), the CGS electrostatic unit of charge (esu), is approximately 3.3356 × 10-10 C or about 1/3 nC.

SI electricity units

SI electromagnetic units

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Quantity Name Symbol Dimensions
Current ampere (SI base unit) A A
Electric charge, Quantity of electricity coulomb C A·s
Potential difference volt V J/C = kg·m2·s−3·A−1
Resistance, Impedance, Reactance ohm Ω V/A = kg·m2·s−3·A−2
Resistivity ohm metre Ω·m kg·m3·s−3·A−2
Electrical power watt W V·A = kg·m2·s−3
Capacitance farad F C/V = kg−1·m−2·A2·s4
Elastance reciprocal farad F−1 kg·m2·A−2·s−4
Permittivity farad per metre F/m kg−1·m−3·A2·s4
Conductance, Admittance, Susceptance siemens S Ω−1 = kg−1·m−2·s3·A2
Conductivity siemens per metre S/m kg−1·m−3·s3·A2
Magnetic flux weber Wb V·s = kg·m2·s−2·A−1
Magnetic flux density tesla T Wb/m2 = kg·s−2·A−1
Magnetic induction ampere per metre A/m A·m−1
Reluctance ampere-turns per weber A/Wb kg−1·m−2·s2·A2
Inductance henry H Wb/A = V·s/A = kg·m2·s−2·A−2
Permeability henry per metre H/m kg·m·s−2·A−2
Magnetic susceptibility (dimensionless) χ -

See also


Also helps finding: oulomb, culomb, colomb, couomb, coulmb, coulob, coulom, soulomb, doulomb, foulomb, xoulomb, voulomb, koulomb, ciulomb, cpulomb

   
 
  
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