A copper wire has a square cross section 6.2mm on a side. The wire is 8.0m long and carries a current of 5.2A. The density of free electrons is 8.0x10^28 #/m^3. The resistivity of the copper is: 1.72x10^-8 ohms.m a) What is the current density in the wire? b) What is the electric field in the wire? c) How much time is required for an electron to travel the length of the wire(4m)?

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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.