Copper has 8.5 x 1028 free electrons per cubic meter. A 75.0-cm length of copper wire with a diameter of 2.05 mm, carries 4.97 A of current. a. How much time does it take for an electron to travel the length of the wire? b. Repeat (a) for a wire with a diameter of 4.12 mm of the same length that carries the same current. c. How does changing the diameter of the wire affect the drift velocity of the electrons in the wire?

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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.