How is the electric potential difference between the two points defined? State it's S.I. unit.

Explain the statement 'the potential difference between two points is 1 volt'.

Define the term electric potential. State it's S.I. unit.

(a) State whether the current is a scalar or vector? What does the direction of current convey?

(b) State whether the potential is a scalar or vector? What does the positive and negative sign of potential convey?