system
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human
What constant driving force is behind Ohm's Law?

I'm coming from a chemistry standpoint and I'm wondering what constant driving force is behind the Ohm's Law model of EMF, resistance, and current (assume DC here, as from a chemical battery).  I don't like the analogy that, say, a 9V battery "tries" to provide 9V, but if the load between the terminals is small enough, then it "can't provide" 9V.  That personification bugs me.

I know of the power equation (P = V * I), but that doesn't answer my question.  I'm wondering what physical forces are behind that equation.  The model works, but I'm wondering why.  I'm guessing that some kind of chemical reaction "force" (put in quotes because it is not exactly a force, but I don't know a better term) is behind this.

Any ideas?
gpt
It's due to the mean-field potential that the electrons are subjected to when traveling along a conductor. All that energy takes away from the total possible energy the electrons could have, if there was no resistance in the wire. The electron's total energy would be the energy difference between both electrodes. It's also interesting to note that conductivity is not the same along all directions, there are optimum paths for the electrons to flow, and that has to do with the unit cell structure (specifically cristalline planes) and the types of atoms the material is made from.