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Siemens (unit)The siemens (symbol: S) is the SI derived unit of electric conductance. It is named after the German inventor and industrialist Ernst Werner von Siemens, and is equivalent to the previously used designation of this unit, the mho. In English, the term siemens is used both for the singular and plural. The 14th General Conference on Weights and Measures approved the addition of the siemens as an SI derived unit in 1971.
Additional recommended knowledgeDefinition
For a physical object, typically an electronic device, with electrical resistance R, the conductance G is defined as
where I is the current through the object and V is the voltage (electrical potential difference) across the object. The unit siemens for the conductance G is defined by Note that the last term is in SI base units where A is the symbol for ampere, the unit of electric current; kg is the symbol for kilogram, the unit of mass; m is the symbol for metre, the unit of length; and s is the symbol for the time unit second. C is the symbol for the SI derived unit of electric charge, the coulomb; V is the symbol for the SI derived unit of voltage, the volt; and Ω is the symbol for the SI derived unit of electrical resistance, the ohm. So for a device with conductance one siemens, then the electric current through it with one volt across it is one ampere, and for each extra volt across it the electric current through it increases by one ampere. Example: The conductance of a resistor with resistance six ohms is G = 1/(6 Ω) MhoThe siemens is equivalent to the previously used term mho unit, which was derived from spelling ohm backwards and written with an upside-down capital Greek letter Omega: References
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Siemens_(unit)". A list of authors is available in Wikipedia. |