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- Conventional_electrical_unit abstract "A conventional electrical unit (or conventional unit where there is no risk of ambiguity) is a unit of measurement in the field of electricity which is based on the so-called \"conventional values\" of the Josephson constant and the von Klitzing constant agreed by the International Committee for Weights and Measures (CIPM) in 1988. These units are very similar in scale to their corresponding SI units, but are not identical because of their different definition. They are distinguished from the corresponding SI units by setting the symbol in italic typeface and adding a subscript \"90\" – e.g., the conventional volt has the symbol V90 – as they came into international use on 1 January 1990.This system was developed to increase the precision of measurements: The Josephson and von Klitzing constants can be realized with great precision, repeatability and ease. The conventional electrical units have achieved acceptance as an international standard and are commonly used outside of the physics community in both engineering and industry.The conventional electrical units are \"quasi-natural\" in the sense that they are completely and exactly defined in terms of fundamental physical constants. They are the first set of measurement units to be defined in this way, and as such, represent a significant step towards using \"natural\" fundamental physics for practical measurement purposes. However, the conventional electrical units are unlike other systems of natural units in that some physical constants are not set to unity but rather set to fixed numerical values that are very close (but not precisely the same) to those in the common SI system of units.Four significant steps were taken in the last half century to increase the precision and utility of measurement units. In 1967 the Thirteenth General Conference on Weights and Measures (CGPM) defined the second of atomic time in the International System of Units as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. In 1983, the seventeenth CGPM redefined the metre in terms of the second and the speed of light, thus fixing the speed of light at exactly 299,792,458 m/s. And in 1990, the eighteenth CGPM adopted conventional values for the Josephson constant and the von Klitzing constant, fixing the conventional Josephson constant at exactly 483,597.9 ×109 Hz/\"V\", and the conventional von Klitzing constant at exactly 25 812.807 \"Ω\" (again, these volts and ohms are not precisely the same as the SI definitions but very nearly equivalent).".
- Conventional_electrical_unit wikiPageExternalLink electrical-units-history.html.
- Conventional_electrical_unit wikiPageID "19479876".
- Conventional_electrical_unit wikiPageLength "10446".
- Conventional_electrical_unit wikiPageOutDegree "58".
- Conventional_electrical_unit wikiPageRevisionID "686388885".
- Conventional_electrical_unit wikiPageWikiLink Ampere.
- Conventional_electrical_unit wikiPageWikiLink Caesium.
- Conventional_electrical_unit wikiPageWikiLink Category:Electromagnetism.
- Conventional_electrical_unit wikiPageWikiLink Category:Metrology.
- Conventional_electrical_unit wikiPageWikiLink Category:Systems_of_units.
- Conventional_electrical_unit wikiPageWikiLink Centimetre–gram–second_system_of_units.
- Conventional_electrical_unit wikiPageWikiLink Coulomb.
- Conventional_electrical_unit wikiPageWikiLink Dimensionless_physical_constant.
- Conventional_electrical_unit wikiPageWikiLink Electrical_resistance_and_conductance.
- Conventional_electrical_unit wikiPageWikiLink Electricity.
- Conventional_electrical_unit wikiPageWikiLink Electromotive_force.
- Conventional_electrical_unit wikiPageWikiLink Electron.
- Conventional_electrical_unit wikiPageWikiLink Elementary_charge.
- Conventional_electrical_unit wikiPageWikiLink Farad.
- Conventional_electrical_unit wikiPageWikiLink General_Conference_on_Weights_and_Measures.
- Conventional_electrical_unit wikiPageWikiLink Gravitational_constant.
- Conventional_electrical_unit wikiPageWikiLink Ground_state.
- Conventional_electrical_unit wikiPageWikiLink Hartree.
- Conventional_electrical_unit wikiPageWikiLink Henry_(unit).
- Conventional_electrical_unit wikiPageWikiLink Hyperfine_structure.
- Conventional_electrical_unit wikiPageWikiLink Impedance_of_free_space.
- Conventional_electrical_unit wikiPageWikiLink International_Committee_for_Weights_and_Measures.
- Conventional_electrical_unit wikiPageWikiLink International_System_of_Units.
- Conventional_electrical_unit wikiPageWikiLink Josephson_effect.
- Conventional_electrical_unit wikiPageWikiLink Josephson_voltage_standard.
- Conventional_electrical_unit wikiPageWikiLink Magnetic_flux_quantum.
- Conventional_electrical_unit wikiPageWikiLink Metre.
- Conventional_electrical_unit wikiPageWikiLink Natural_units.
- Conventional_electrical_unit wikiPageWikiLink Ohm.
- Conventional_electrical_unit wikiPageWikiLink Planck_constant.
- Conventional_electrical_unit wikiPageWikiLink Quantum_Hall_effect.
- Conventional_electrical_unit wikiPageWikiLink Rydberg_constant.
- Conventional_electrical_unit wikiPageWikiLink Second.
- Conventional_electrical_unit wikiPageWikiLink Speed_of_light.
- Conventional_electrical_unit wikiPageWikiLink Units_of_measurement.
- Conventional_electrical_unit wikiPageWikiLink Vacuum_permeability.
- Conventional_electrical_unit wikiPageWikiLink Vacuum_permittivity.
- Conventional_electrical_unit wikiPageWikiLink Volt.
- Conventional_electrical_unit wikiPageWikiLink Watt.
- Conventional_electrical_unit wikiPageWikiLinkText ""conventional" value".
- Conventional_electrical_unit wikiPageWikiLinkText "Conventional electrical unit".
- Conventional_electrical_unit wikiPageWikiLinkText "conventional electrical unit".
- Conventional_electrical_unit wikiPageWikiLinkText "conventional value".
- Conventional_electrical_unit wikiPageWikiLinkText "conventional values".
- Conventional_electrical_unit wikiPageWikiLinkText "conventional".
- Conventional_electrical_unit wikiPageUsesTemplate Template:CODATA2006.
- Conventional_electrical_unit wikiPageUsesTemplate Template:E.
- Conventional_electrical_unit wikiPageUsesTemplate Template:Gaps.
- Conventional_electrical_unit wikiPageUsesTemplate Template:Reflist.
- Conventional_electrical_unit wikiPageUsesTemplate Template:See_also.
- Conventional_electrical_unit wikiPageUsesTemplate Template:Sub.
- Conventional_electrical_unit wikiPageUsesTemplate Template:Systems_of_measurement.
- Conventional_electrical_unit wikiPageUsesTemplate Template:Update_after.
- Conventional_electrical_unit wikiPageUsesTemplate Template:Use_dmy_dates.
- Conventional_electrical_unit subject Category:Electromagnetism.
- Conventional_electrical_unit subject Category:Metrology.
- Conventional_electrical_unit subject Category:Systems_of_units.
- Conventional_electrical_unit hypernym Unit.
- Conventional_electrical_unit type Organisation.
- Conventional_electrical_unit type Physic.
- Conventional_electrical_unit type Science.
- Conventional_electrical_unit type Thing.
- Conventional_electrical_unit comment "A conventional electrical unit (or conventional unit where there is no risk of ambiguity) is a unit of measurement in the field of electricity which is based on the so-called \"conventional values\" of the Josephson constant and the von Klitzing constant agreed by the International Committee for Weights and Measures (CIPM) in 1988. These units are very similar in scale to their corresponding SI units, but are not identical because of their different definition.".
- Conventional_electrical_unit label "Conventional electrical unit".
- Conventional_electrical_unit seeAlso Natural_units.
- Conventional_electrical_unit sameAs Q5166318.
- Conventional_electrical_unit sameAs m.04mxyv5.
- Conventional_electrical_unit sameAs Q5166318.
- Conventional_electrical_unit wasDerivedFrom Conventional_electrical_unit?oldid=686388885.
- Conventional_electrical_unit isPrimaryTopicOf Conventional_electrical_unit.