Question

What is potential difference

Answer 1

potential difference:- potential difference between two points B and A in an electrostatic field is the amount of workdone in carrying unit positive test charge from A to B (against the electrostatic force of the field) along any path between two points .

e.g. Vb - Va=Wab/q
q is the positive test charge .

Answer 2

For current to flow in a circuit , there should be a existence of a potential difference( this is the necessary and sufficient condition)