An aluminum wire with a diameter of 0.125 mm has a uniform electric field of 0.255 V/m imposed along its entire length. The temperature of the wire is 35.0°C. Assume one free electron per atom. (a) Use the information in this Table of Resistivities and Temperature Coefficients to determine the resistivity (in Ω · m) of aluminum at this temperature. ρ =  Ω · m (b) What is the current density (in MA/m2) in the wire? J =  MA/m2 (c) What is the total current (in mA) in the wire? I =  mA

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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.