Calculate the drift velocity of electrons inside an aluminum wire that has a diameter of 2.053 mm (12-gauge) carrying a 20.0-A current. Assume one free electron per Al atom. The density and mass of Al is 2.70 x 10^3 kg/m^3 and 26.98 g/mol, respectively. (1 mol = 6.02 x 10^(23) atoms, charge of each carrier = 1.60 x 10^(-19) C).

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.