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electromotive force

(force that drives an electric current)

Electromotive force (EMF) is the electric "force" that drives an electric current, produced by batteries, generators, etc., and measured in volts. Where there is a voltage difference, there is an electromotive force equal to that difference.

It is an electric rather than a physical "force", and the word "pressure" might be a better word, being more analogous to physical pressure than physical force.