An aluminum wire (ρ = 2.82x10-8Ωm at 20 °C and α = 3.9x10-3°C-1)with a diameter of 0.085 mm has a uniform electric field of 0.185 V/m imposed along its entire length. The temperature of the wire is 35.0° C. Assume one free electron per atom. Determine the resistivity of aluminum at this temperature? What is the current density in the wire? What is the total current in the wire? What is the drift speed of the conduction electrons? What potential difference must exist between the ends of a 2.50-m length of the wire to produce the stated electric field?

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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.