Definition of Ampere

[rya...@cs.aston.ac.uk]

I would like a reference to the document which details the current method for
defining the amp.

I believe it is defined as the current which causes a certain force between two
conductors of 1m length but I would like to refer to the paper where the
actual international defintion is described.

Can anybody help ?

If you can, I would be grateful if you could Email a reference (or a pointer) to
rya...@cs.aston.ac.uk

Thanks,
Paul Ryan

---
Aston University
Birmingham, UK

[Paul Karol]

My IUPAC handbook on Quantities, Units and Symbols has the 1948
definition of the ampere as still valid:

"The ampere is that constant current which, if maintained in two
straight parallel conductors of infinite length, of negligible circular
cross section, and placed 1 metre apart in vacuum, would produce between
these conductors a force equal to 2 X 10^(-7) newton per metre of
length."

Paul J. Karol
Nuclear Chemist

[Dick Bukrey]

Paul Karol (pk...@andrew.cmu.edu) wrote:
: My IUPAC handbook on Quantities, Units and Symbols has the 1948

: definition of the ampere as still valid:

In Phys Teach, Feb 86, Ludwik Kowalski states: in 1954 the 10th General conf-
erence of Weights and Measures formally legalized the MKSA system. In the
rationalized form in became part of our present SI system, which became
official in 1960.

Presume one would need the reports of these 1954 and 1960 meetings to get the
exact wording of the definition. Of course, it may be the same as the
previous post.

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Dick Bukrey, Physics Dept r...@lucpue.physics.luc.edu
Loyola University Chicago rbu...@lucpug.it.luc.edu