A wire has a current density of 7.47 × 106 A/m². If the cross-sectional area of the wire is 2.39 mm², what current I does the wire carry? I = With this current, how much time t is required for 3.33 × 1020 electrons to pass any point on the wire? t = A S

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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.