A cell has an electromotive force (e.m.f.) of 1.5 V. What does this statement mean?
A The cell converts 1.0 J of energy when driving 1.5 C of charge round a complete circuit.
B The cell converts 1.5 J of energy when driving 1.0 C of charge round a complete circuit.
C The cell converts 1.5 J of energy per second when driving 1.0 C of charge round a complete circuit.
D The cell converts 1.5 W of power when driving 1.0 C of charge round a complete circuit.