Question

Which of the following truly describes the electromotive force?
voltage provided by a battery
work done on a charge
power produced by a circuit
force applied on a charge

Answer 1

The correct answer is
voltage provided by a battery

In fact, the electromotive force (e.m.f.) of a battery corresponds to the voltage provided by the battery, and this voltage is provided by the work done by the battery which converts the chemical energy of the cell into electrical energy (the current in the circuit).

Answer 2

the correct answer is
voltage provided by a battery

it is the force required to move one unit of charge across the poles.