|a. a source of energy that can cause a current to flow in an electrical circuit or device|
|b. Compare potential difference emf, Abbreviation: EMF, E the rate at which energy is drawn from this source when unit current flows through the circuit or device, measured in volts|
electromotive force e·lec·tro·mo·tive force (ĭ-lěk'trō-mō'tĭv)
The energy per unit charge that is reversibly converted from chemical or other forms of energy into electrical energy in a battery.
Electric potential or voltage. Electromotive force is not really a force, but a measure of how much work would be done by moving an electric charge.