Establish the relation between drift velocity of electrons (\(v_d\)) and electric current (\(I\)) in a conductor.
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To easily memorize this fundamental derivation formula, remember the acronym name "NeAVd" (\(I = n e A v_d\)). It shows that current depends purely on the material properties (\(n\)), geometry (\(A\)), and electron kinetics (\(v_d\)).