electrical units

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Original poster: Thomas <tom-at-pwrcom-dot-com.au> 

 >I have no idea where the Volt came from, or the Ampere, for that matter.
I suspect they were totally arbitrary.

Good question. This is all I remember:

One Ampare is one Coulomb of charge flowing past a point per second.

A volt is the EMF required to force one Ampare through one Ohm.

Now... was the Coulomb (6.25 x 10^18 electrons) defined first and if so how?

And the Ohm?

Tom L.