Back Siemens (eenheid) Afrikaans سيمنز (وحدة) Arabic Siemens (unidá) AST Сіменс (адзінка вымярэння) Byelorussian Сымэнс (адзінка вымярэньня) BE-X-OLD Сименс Bulgarian সিমেন্স (একক) Bengali/Bangla Simens BS Siemens (unitat) Catalan Siemens (jednotka) Czech
| siemens | |
|---|---|
| Unit system | SI |
| Unit of | electric conductance |
| Symbol | S |
| Named after | Ernst Werner von Siemens |
| Conversions | |
| 1 S in ... | ... is equal to ... |
| SI base units | kg−1⋅m−2⋅s3⋅A2 |
| inverse ohm | 1 Ω−1 |
| mho | 1 ℧ |
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. The siemens was adopted by the IEC in 1935,[1] and the 14th General Conference on Weights and Measures approved the addition of the siemens as a derived unit in 1971.[2]
The unit is named after Ernst Werner von Siemens. In English, the same word siemens is used both for the singular and plural.[3] Like other SI units named after people, the symbol (S) is capitalized but the name of the unit is not. For the siemens this distinguishes it from the second, symbol (lower case) s.
The related property, electrical conductivity, is measured in units of siemens per metre (S/m).
- ^ Minutes (PDF). 14th General Conference on Weights and Measures. 1971. p. 53.
- ^ Minutes (PDF). 14th General Conference on Weights and Measures. 1971. p. 78.
- ^ "Chapter 9: Rules and Style Conventions for Spelling Unit Names". NIST Guide to the SI (Report). National Institute of Standards and Technology. 2008. Archived from the original on 2019-05-06. Retrieved 2017-12-22.