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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/µV.

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
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

• SI
• Ohm's Law

Results from FactBites:

 Detroit Auto Show: Chevrolet Volt Concept (1085 words) In the bigger scheme of things, the Volt saves the environment some 4.4 metric tons of carbon dioxide that might otherwise be emitted into the air in a year, GM claims. Instead of a large battery and small engine like in the Volt, it would have a fuel-cell propulsion system with a small battery to capture energy from a regenerative braking system, and would need only half of the hydrogen storage of the original Sequel concept to achieve 300 miles of range. The Volt accelerates from a dead stop to 60 mph in less than 8.5 seconds (the EV1 took about a second longer), and has a top speed of 120 mph.
 Volt Telecom Group: Welcome (181 words) Volt Telecom Group is the premier service organization for turnkey wireless engineering and integration. Our customer-driven, comprehensive solutions differentiate Volt Telecom Group from other suppliers and our industry reputation and quality business relationships are reflected in our ability to provide rapid-response services and integrated solutions for almost any need. All information contained on this website is made available only on the terms and conditions, including restrictions, set forth on the Volt Information Services Legal Page.
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