The emf of a battery is equal to its terminal potential difference:
A)under all conditions
B)only when the battery is being charged
C)only when a large current is in the battery
D)only when there is no current in the battery
E)under no conditions

Question

Quizplus · Accepted Answer

The emf (electromotive force) of a battery is equal to its terminal potential difference only when there is no current in the battery. This is because, under load (when current is flowing), the internal resistance of the battery causes a drop in the voltage available at the terminals.

The Emf of a Battery Is Equal to Its Terminal