The current supplied to an air conditioner unit is 5 amps. The air conditioner is wired using a 10-gauge (diameter 2.588 mm) wire. The charge density of the wire is n= 8.48·1028  electrons/m3. Find the magnitude of a) current density and b) the drift velocity.

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.