An aluminum wire having a radius of 7.53 mm and carrying a current of 86.2 mA is connected in a circuit. What is the drift speed of the electrons carrying this current? The density of electrons in an aluminum is 6.02×1028electronsm36.02×1028electronsm3 . There is one conduction electron per atom in aluminum. Note: elementary particle charge e=1.602×10−19Ase=1.602×10−19As

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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.