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Encyclopedia > Kilovolt

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/µV.


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 A·s Electric charge, Quantity of electricity
volt V J/C = kg·m2·s−3·A−1 Potential difference
ohm Ω V/A = kg·m2·s−3·A−2 Resistance, Impedance, Reactance
ohm metre Ω·m kg·m3·s−3·A−2 Resistivity
farad F C/V = kg−1·m−2·A2·s4 Capacitance
farad per metre F/m kg−1·m−3·A2·s4 Permittivity
reciprocal farad F−1 kg1·m2·A−2·s−4 Elastance
siemens S Ω−1 = kg−1·m−2·s3·A2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1·m−3·s3·A2 Conductivity
weber Wb V·s = kg·m2·s−2·A−1 Magnetic flux
tesla T Wb/m2 = kg·s−2·A−1 Magnetic flux density
ampere per metre A/m m−1·A magnetic induction
ampere-turns per weber A/Wb kg−1·m−2·s2·A2 Reluctance
henry H V·s/A = kg·m2·s−2·A−2 Inductance
henry per metre H/m kg·m·s−2·A−2 Permeability
(dimensionless) - - Magnetic susceptibility

See also

  • SI
  • Ohm's Law

  Results from FactBites:
 
Apparatus and method for spot-knocking television picture tube electron guns - Patent 4326762 (7652 words)
The respective power sources according to the claimed invention preferably provide a positive potential of fifty kilovolts to the anode electrode, and minus twenty-five kilovolts to the adjacent electrode (or electrodes), with the potentials having values which are at least long-term averages.
During the final step wherein the potential is at the fifty kilovolts level, (providing a total difference is potential of 75 kilovolts) the per-second divisions may be one-eighth of a second on, and seven-eighths of a second off.
The first potential is preferably in the range of thirty to fifty kilovolts, and the second potential is preferably in the range of minus ten to minus thirty kilovolts.
  More results at FactBites »


 

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