Read the statements given below and answer the questions that follow.
(i) What is physically implied when the potential difference between point A and point B in a circuit is 5V? Explain in terms of work done and charge moved.
(ii) Explain why potential difference is expressed as joule per coulomb and not coulomb per joule.
(iii) Potential difference is a scalar quantity even though it is related to the electric field, which is a vector quantity. Give a brief reason for this observation.