This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Conventional electrical unit" – news · newspapers · books · scholar · JSTOR(November 2018) (Learn how and when to remove this message)
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, the von Klitzing constant agreed by the International Committee for Weights and Measures (CIPM) in 1988, as well as ΔνCs used to define the second. These units are very similar in scale to their corresponding SI units, but are not identical because of the different values used for the constants. 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, and are exactly defined in terms of the universal constants e and h. The conventional electrical units represent a significant step towards using "natural" fundamental physics for practical measurement purposes. They achieved acceptance as an international standard in parallel to the SI system of units and are commonly used outside of the physics community in both engineering and industry. Addition of the constant c would be needed to define units for all dimensions used in physics, as in the SI.
The SI system made the transition to equivalent definitions 29 years later but with values of the constants defined to match the old SI units more precisely. Consequently, the conventional electrical units differ slightly from the corresponding SI units, now with exactly defined ratios.
and 28 Related for: Conventional electrical unit information
A conventionalelectricalunit (or conventionalunit where there is no risk of ambiguity) is a unit of measurement in the field of electricity which is...
United States (US) Standards and conventions Conventionalelectricalunit – Historical high-precision units of measurement Coordinated Universal Time (UTC) –...
current is used to energise equipment, and in electronics dealing with electrical circuits involving active components such as vacuum tubes, transistors...
components), therefore flow in the opposite direction of conventional current flow in an electrical circuit. A current in a wire or circuit element can flow...
A transcutaneous electrical nerve stimulation (TENS or TNS) is a device that produces mild electric current to stimulate the nerves for therapeutic purposes...
2867), a planetary nebula in the constellation Carina C90, the conventionalelectricalunit for the coulomb C90 audio cassette, a blank audio cassette in...
Voltage, also known as (electrical) potential difference, electric pressure, or electric tension is the difference in electric potential between two points...
potential difference are made in conventionalelectricalunits (rather than SI units), which are based on fixed "conventional values" of the Josephson constant...
of SI base units, as of 2019 the Josephson constant has an exact value of KJ = 483597.84841698... GHz/V, which replaced the conventional value KJ-90...
The International System of Electrical and Magnetic Units is an obsolete system of units used for measuring electrical and magnetic quantities. It was...
Electrical wiring in the United Kingdom is commonly understood to be an electrical installation for operation by end users within domestic, commercial...
hydrogen-based fuels, respectively, to generate electrical output. The reverse conversion of electrical energy into mechanical energy is done by an electric...
one technique can be used simultaneously. The conventional symbol used for a submarine branching unit in maps of cable routes is a small equilateral...
electrodynamics. The SI derived unit of electric charge is the coulomb (C) named after French physicist Charles-Augustin de Coulomb. In electrical engineering it is...
Electric power is the rate of transfer of electrical energy within a circuit. Its SI unit is the watt, the general unit of power, defined as one joule per second...
two sets of units for electrical and magnetic properties – the electrostatic set of units and the electromagnetic set of units. The CGS units of electricity...
In electrical engineering, admittance is a measure of how easily a circuit or device will allow a current to flow. It is defined as the reciprocal of impedance...
Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process...
An electrical grid (or electricity network) is an interconnected network for electricity delivery from producers to consumers. Electrical grids consist...
These prefixes are also commonly used to create metric units corresponding to older conventionalunits, for example hectares and hectopascals. Prefixes may...
Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in...
The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the...
Electrical Code as the conventionalunit in North America for measuring the volume of electrical boxes. Because of the extensive export of electrical...
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. Electrical conduit may be made of metal, plastic...
electrolysis than the minimum energy requirement predicted or measured by conventional science. The mechanism of action was alleged to involve "Brown's gas"...
no traditional customary unit, international units are used, sometimes mixed with customary units: for example, electrical resistance of wire expressed...
frequency is defined as the number of cycles or repetitions per unit of time. The conventional symbol for frequency is f or ν (the Greek letter nu) is also...
of the total unit is then proportional to the total cross section of all the pillars, which are often connected in series electrically to reduce the...
Global Information