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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.
Mercury column resistance unit, about 1860, partially filled. (Munich, 2015) The Siemens mercury unit is an obsolete unit of electrical resistance.It was defined by Werner von Siemens in 1860 as the resistance of a mercury column with a length of one metre and uniform cross-section of 1 mm 2 held at a temperature of zero degrees Celsius. [1]
Two of the base SI units and 17 of the derived units are named after scientists. [2] 28 non-SI units are named after scientists. By this convention, their names are immortalised. As a rule, the SI units are written in lowercase letters, but symbols of units derived from the name of a person begin with a capital letter.
Siemens Nexas, a type of metro train that operates in Melbourne, Australia; siemens (unit), symbol S, the SI derived unit of electrical conductance; Siemens-Martin process, open hearth furnace process invented by Carl Siemens; Siemens mercury unit, an obsolete unit of electrical resistance
Siemens-Duewag U2 LRV – Edmonton Transit System and Calgary Transit – Alberta, Canada; Siemens SD-160 – Edmonton Transit System and Calgary Transit – Alberta, Canada; LHB/Siemens M1/M2/M3 Metro (Pair) – Prague Metro Czech Republic; Siemens-Adtranz LRV; MX3000 Metro car for Oslo (SGP Wien works) – Oslo T-bane, Norway; CAF S4000 Metro ...
Ernst Werner Siemens (von Siemens from 1888; / ˈ s iː m ən z / SEEM-ənz; [1] German: [ˈziːməns,-mɛns]; [2] 13 December 1816 – 6 December 1892) was a German electrical engineer, inventor and industrialist. Siemens's name has been adopted as the SI unit of electrical conductance, the siemens.
Siemens is the largest industrial manufacturing company in Europe, [7] and holds the position of global market leader in industrial automation and industrial software. [8] The origins of the conglomerate can be traced back to 1847 to the Telegraphen Bau-Anstalt von Siemens & Halske established in Berlin by Werner von Siemens and Johann Georg ...
SIMATIC is a series of programmable logic controller and automation systems, developed by Siemens. Introduced in 1958, the series has gone through four major generations, the latest being the SIMATIC S7 generation. The series is intended for industrial automation and production. The name SIMATIC is a registered