Electric Current
An electric charge can be at rest or in motion. We speak of static electricity when the charge is at rest, but when the charge is in motion, it is referred to as current electricity.
Electric current, I, is defined as the rate of flow of electric charge along a conductor.
A stream of moving charges (or electrons) constitute an electric current. We can describe the flow of electric charge along a conductor, e.g. a metallic wire, by expressing it in terms of the section of the conductor in a given time t. The quantity of charge Q is measured in coulombs and the time t in seconds. Hence, current I, is given mathematically by the expression:
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