The electric potential sets across the terminals of a battery when attached to load is called:

Explanation

The correct answer is terminal voltage, which specifically refers to the voltage across the terminals of a battery when it is connected to a load. This voltage is affected by the internal resistance of the battery and can be lower than the EMF of the battery when a current flows. Potential difference refers to the general concept of voltage difference but does not specify the context of a battery's terminals under load. EMF is the maximum voltage the battery can provide when no current is drawn; it does not account for the effects of internal resistance. Internal potential energy is more about the stored energy inside the battery rather than the voltage available at its terminals.