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Microscopic Ohm's Law 
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#1
Apr1609, 01:44 PM

P: 25

1. The problem statement, all variables and given/known data
Explain the terms used in the microscopic version of Ohm's Law 2. Relevant equations j=oE 3. The attempt at a solution Well I know what we have here is the current density within a conductor is equal to its conductivity multiplied by an 'Efield'. But what is this Efield? Is it an external field that acts upon the wire? But if this is the case will the electrons in the conductor not just move in a few microseconds to go back into equilibrium meaning j=0. You could act on it with an varying field but then how would the calculation work out? Or is E the field inside the conductor caused by the current density? Thanks 


#2
Apr1609, 01:57 PM

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#3
Apr1609, 04:23 PM

P: 25

Hmmm I guess I've spent so long doing electrostatics that I'm struggling a bit with the intuition of currents.
So from the link above, am I right in thinking the E field is from within the wire caused by a potential difference from a power source? 


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