statampere | |
---|---|
Unit system | CGS-ESU and Gaussian[1]:278 |
Unit of | electric current[1]:278 |
Symbol | statA[1]:278 |
Named after | A.-M. Ampère |
In CGS base units | g1/2⋅cm3/2⋅s−2 [2]:26 |
Conversions | |
1 statA in ... | ... corresponds to ... |
SI base units | 10/ccgs ampere ≈ 3.33564×10−10 ampere[Note 1][3]:16[2]:26 |
CGS-EMU | 1/ccgs abampere ≈3.33564×10−11 abampere[3]:16 |
The statampere (statA) is the derived electromagnetic unit of electric current in the CGS-ESU (electrostatic cgs) and Gaussian systems of units.[1]:278 One statampere corresponds to 10/ccgs ampere[Note 1] ≈ 3.33564×10−10 ampere in the SI system of units.
The name statampere is a shortening of abstatampere, where the idea was that the prefix abstat should stand for absolute electrostatic and mean ‘belonging to the CGS-ESU (electrostatic cgs) absolute system of units’.[Note 2]
The esu-cgs (or "electrostatic cgs") units are one of several systems of electromagnetic units within the centimetre–gram–second system of units; others include CGS-EMU (or "electromagnetic cgs units"), Gaussian units, and Heaviside–Lorentz units. In the cgs-emu system, the unit of electric current is the abampere. The unit of current in the Heaviside–Lorentz system doesn't have a special name.
The other units in the cgs-esu and Gaussian systems related to the statampere are:
[p. 534] The expedient suggests itself of attaching the prefix ab or abs to a practical or Q. E. S. unit, in order to express the absolute or corresponding C. G. S. magnetic unit. … [p. 535] In a comprehensive system of electromagnetic terminology, the electric C. G. S. units should also be christened. They are sometimes referred to in electrical papers, but always in an apologetic, symbolical fashion, owing to the absence of names to cover their nakedness. They might be denoted by the prefix abstat.
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