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Fair enough. But wouldn't the ultimate flow of charge through our bodies be
electrons migrating from atom to atom. Admittedly this is not a single
electron making the entire run from foot to finger, but is anything lost by
thinking of it as a single electron.
Also, what would account for the light from the spark in the plasma
model? I had always assumed that the "jumping electrons" collided with the
H2 and N2, knocking their interior electrons electrons to a higher energy
level and that the light was emitted in the subsequent decay. In the plasma
model, I imagine that the free electrons would also emit EM radiation when
they reattach to the atoms molecules after the conditions to maintain the
plasma no longer exist. But this I suspect would involve primarily the
outermost electrons and I don't know if the resulting radiation would be
visible light.