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Question

A current of 1.0 A exists in a copper wire of cross-section 1.0mm2. Assuming one free electron per atom calculate the drift speed of the free electrons in the wire. The density of copper is 9000kgm3.

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Solution

Mole=(Mass63.546)=(900063.546)
Mole=141.62
Totalatom=141.62×NA=Totalelectrons
Vd=(InAq)=1141.62×6.6×101×1×106×1.6×1019
Vd=100141.62×6.6×1.6=0.06m/s

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