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Encyclopedia > Volts

The volt is the SI derived unit for electric potential and voltage (derived from the ampere and watt). It is named in honor of Alessandro Volta, who, in 1800, invented the voltaic pile, the first chemical battery.


The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power. Hence, it is has the base SI representation m2 kg s-3 A-1, which can be equally represented as one joule of energy per coulomb of charge, J/C.


Since 1990 the volt is maintained internationally using the Josephson effect, where a conventional value is used for the Josephson constant, fixed by the 18th CGPM as


K{J-90} = 0.4835979 GHz/V.


SI electricity units

SI electromagnetism units

edit  (http://en.wikipedia.org/w/index.php?title=Template:SI_electromagnetism_units&action=edit)

Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C As Electric charge, Quantity of electricity
volt V J/C = kgm2s−3A−1 Potential difference
ohm Ω V/A = kgm2s−3A−2 Resistance, Impedance, Reactance
ohm metre Ωm kgm3s−3A−2 Resistivity
farad F C/V = kg−1m−2A2s4 Capacitance
farad per metre F/m kg−1m−3A2s4 Permittivity
reciprocal farad F−1 kg1m2A−2s−4 Elastance
siemens S Ω−1 = kg−1m−2s3A2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1m−3s3A2 Conductivity
weber Wb Vs = kgm2s−2A−1 Magnetic flux
tesla T Wb/m2 = kgs−2A−1 Magnetic flux density
ampere per metre A/m m−1A magnetic induction
ampere-turns per weber A/Wb kg−1m−2s2A2 Reluctance
henry H Vs/A = kgm2s−2A−2 Inductance
henry per metre H/m kgms−2A−2 Permeability
(dimensionless) - - Magnetic susceptibility

See also

  • SI
  • Ohm's Law

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