[Chris2048]

I think there is a caveat here:

force on electrons is "EMF", https://en.wikipedia.org/wiki/Electromotive_force

This scan be measure in volts, or joules.

"potential difference" seems to be the relative difference between the "EMF" of two conductors, which is analogous to pressure-difference and is the relevant factor wrt current, power, etc.

[hackits]

Cheers Chris, cleared up the issue I had with potential difference didn't see it that way.