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The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.
But, from 1982 until 1994, the 200-amp service panels used a Zinsco frame main breaker. Challenger flourished through the 80s, and was eventually received by Westinghouse in a multi-asset deal, in order for Westinghouse to sell its remaining electrical manufacturing facilities to Eaton Corporation in 1994.
where is the length of the conductor, measured in metres (m), A is the cross-sectional area of the conductor measured in square metres (m 2), σ is the electrical conductivity measured in siemens per meter (S·m −1), and ρ is the electrical resistivity (also called specific electrical resistance) of the material, measured in ohm-metres (Ω ...
[citation needed] The resistance is measured by a conductivity meter. Typical frequencies used are in the range 1–3 kHz. The dependence on the frequency is usually small, [5] but may become appreciable at very high frequencies, an effect known as the Debye–Falkenhagen effect. A wide variety of instrumentation is commercially available. [6]
The base units and the derived units formed as the product of powers of the base units with a numerical factor of one form a coherent system of units. Every physical quantity has exactly one coherent SI unit. For example, 1 m/s = 1 m / (1 s) is the coherent derived unit for velocity.
of SI base units coulomb per square metre: C/m 2: electric displacement field, polarization density: m −2 ⋅s⋅A coulomb per cubic metre: C/m 3: electric charge density: m −3 ⋅s⋅A ampere per square metre: A/m 2: electric current density: m −2 ⋅A siemens per metre: S/m electrical conductivity: m −3 ⋅kg −1 ⋅s 3 ⋅A 2: farad ...
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