Dynamo electric siemens electric conductance admittance electrics Invention invented engineering engineer
The siemens (symbol: S) is the SI derived unit of electric conductance and electric admittance. Conductance and admittance are the reciprocals of resistance and impedance respectively, hence one siemens is equal to the reciprocal of one ohm, and is sometimes referred to as the mho. In English, the term siemens is used both for the singular and plural.[1] The 14th General Conference on Weights and Measures approved the addition of the siemens as an SI derived unit in 1971. This SI unit is named after Ernst Werner von Siemens. As with every SI unit whose name is derived from the proper name of a person, the first letter of its symbol is upper case (S). When an SI unit is spelled out in English, it should always begin with a lower case letter (siemens), except where any word would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because the "d" is lowercase. —Based on The International System of Units,
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