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electrical units
From
:
JBRAUNSDORF@delphi.com
Date
: Fri, 11 Oct 1996 00:35:25 -0500 (EST)
I believe historically there were at least six sets of electrical units
used. The original coulomb was an electrostatic unit the used coulombs law
and related the size of the (equal) charges on two sphere to the repulsive
forces between them at a distance of 1 cm separation.
there was a device appropriately called a coulombometer that was an
electroplating cell that counted the electric charges the deposited a
certain amount of silver by letting a current run through for a while and
massing the silver.
the amount of charge was fundamentaland the the rate of 1 C/s was defined
as the ampere.
after the magnetic effects were discovered it was determined that it
was easier to define the current by experiments that measured the forces
between two coils and the definitions were changed to make the ampere the
fundamental one.
Check old CRCHandbooks for esu, emu, coulomb, abcoulomb, statcoulomb, etc
Jim Braunsdorf
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