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Mar4-10, 08:30 AM
Sci Advisor
HW Helper
P: 8,953
It's simply the absence of an electron.
Because of historical accident, before the discovery of the electron, current was assumed to flow from positive to negative.
It's a bit error prone to have electrons moving one way and current moving the opposite way - so we imagine the movement of the absence of electrons, which go in the same direction as current