A current of 2.0 A is flowing in a typical extension cord of length 3.0 m. The cord is made of copper wire with a diameter 1.50 mm. The charge of an electron is 1.6 × 10−19. The concentration of free electrons in the copper wire is 8.5 × 1028 ?−3 . a. Find the drift velocity of electrons in the wire. b. Under these circumstances, how long does it take for an electron to traverse a 3.0 m length of the extension cord?

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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.