How much energy is transferred by a 12 V power supply to each coulomb of charge which it moves around a circuit?
Here potential difference = 12 V
Charge moved = 1 C
Work done = Potential difference × Charge moved
= 12 × 1 = 12 joule
So 12 J energy is transferred by a 12 V power supply to each coulomb of charge which it move around a circuit.