The table below shows four metals and their corresponding electron density n. A certain current density J is to be produced in four wires each made of the metals in the table below. In which wire will the drift speed va for a particle of charge q be the greatest? In this case, J and q are the same for all metal wires. Electron density ( Metal x1028 m-3) Gold 5.90 Silver 5.86 Copper 8.47 Aluminum 18.1 Aluminum wire Silver wire Copper wire O Gold 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.