Question

3) What is potential difference?
Ans.
Definition of potential difference:
the difference in potential between two points that represents the work in volved or the energy released in the trasfer of a unit quentity of electricity from one point to the other.​

Answer 1

Answer:

but you have already written the answer

Answer 2

potential difference between two points through which current is following is defined as the amount of work done to move a unit charge .

it is denoted by V, V=w/q