Question 39
Current ElectricityThe total energy required to send a unit positive charge round a complete electrical circuit is the
- A.kinetic energy
- B.potential difference
- C.electromotive force
- D.electrical energy.
Show the answer and explanation
Answer: C (electromotive force)
Explanation
The e.m.f. of a source is defined as the energy it gives to each coulomb of charge driven round the whole circuit (including inside the source). Potential difference refers to only part of the circuit.