Abvolt
| abvolt | |
|---|---|
| Unit system | CGS-EMU |
| Unit of | electric potential, electric potential difference (voltage), and electromotive force |
| Symbol | abV |
| Named after | Alessandro Volta |
| In CGS base units | g1/2·cm3/2/s2 [1]:25 |
| Conversions | |
| 1 abV in ... | ... corresponds to ... |
| SI derived units | 10−8 volt |
| CGS-ESU | 1/ccgs statvolt[Note 1] |
The abvolt (abV) is the unit of potential difference in the CGS-EMU system of units. It corresponds to 1/ccgs statvolt ≈ 3.3356×10−11 statvolt in the CGS-ESU system.[Note 1]
Before the 2019 revision of the SI the Abvolt corresponded to exactly 10−8 volt in the SI system. In 2019 the definition of the ampere was changed, and this relationship is very close to true, but no longer exact.
A potential difference of 1 abV will drive a current of one abampere through a resistance of one abohm.
In most practical applications, the volt and its multiples are preferred. The national standard in the United States [2] deprecates the use of the abvolt, suggesting the use of volts instead.
The name abvolt was introduced by Kennelly in 1903 as a short name for the long name (absolute) electromagnetic cgs unit of e.m.f. that was in use since the adoption of the cgs system in 1875.[3] The abvolt was coherent with the CGS-EMU system, in contrast to the volt, the practical unit of e.m.f. that had been adopted too in 1875.
Notes
[edit]- 1 2 The dimensionless constant ccgs = 2.99792458×1010 is numerically equal to the magnitude of the speed of light when the latter is expressed in cm/s.
References
[edit]- ↑ Gyllenbok, Jan (2018). Encyclopaedia of Historical Metrology, Weights, and Measures: Volume 1. Birkhäuser. ISBN 978-3-319-57598-8.
- ↑ IEEE/ASTM SI 10-2002. American National Standard for Use of the International System of Units (SI): The Modern Metric System. New York: IEEE, 30 December 2002, Section 3.3.3.
- ↑ A.E. Kennelly (1903) "Magnetic units and other subjects that might occupy attention at the next international electrical congress" 20th Annual Convention of the American Institute of Electrical Engineers, 1903