Siemens (unit)
Physical unit | |
---|---|
Unit name | Siemens |
Unit symbol | |
Physical quantity (s) | Electrical conductance |
Formula symbol | |
dimension | |
system | International system of units |
In SI units | |
Named after | Werner from Siemens |
Derived from | Volts , amps |
See also: Ohm |
Siemens is the unit of measurement for electrical conductance in the SI and is named after Werner von Siemens . The conductance 1 S is the reciprocal of the electrical resistance 1 Ω . The ohm is the SI unit of electrical resistance:
In 1860 Siemens had published the article Proposal for a reproducible resistance measure in Poggendorff's Annalen der Physik und Chemie , for details see under Ohm . At the 14th General Conference on Weights and Measures in 1971, it was decided to introduce the unit of measurement.
Mho
Mho is an outdated name for the Siemens unit , the name goes back to William Thomson . The designation Mho ( ohms read backwards) and the symbol ℧ (an upside-down large omega ) express that it is the reciprocal of the unit ohm. They were used until the 1930s, and informally in the USA in the field of electronics.
Individual evidence
- ↑ Werner Siemens: Proposal for a reproducible measure of resistance . In: Annals of Physics and Chemistry . tape 186 , no. 5 , 1860, p. 1-20 , doi : 10.1002 / andp.18601860502 .
- ^ Minutes of the 14th General Conference on Weights and Measures , 1971, p. 78, accessed Nov. 11, 2019
- ↑ William Maver: American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus, operation , 1903rd