Drift Speeds 

Current through a conductor can be considered to be the flow of a stream of positive charges. The speed of flow of these charged particles is the drift speed of current flowing in a conductor. This drift speed is acquired when an electric field E is established in a conductor. The speed is given by v­_d in the direction of the electric field. The carrier charge density is proportional to the number of electrons (n) in the conductor. The velocity v_d is related to current density, J by the following equation: 

                                                                                                            J = (ne)v_d  

Where 'ne' is the carrier charge density. Try out the following test.
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Quiz

The relation between the drift speed and the number of electrons in a conductor is:

 
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