Question

what is potential difference?

Answer 1

work done by the electric force on unit positive charge to move it through a distance is called potential difference. it is denoted by V . this potential difference is also called as voltage. SI unit of potential difference is "volt" and denoted by V.
 1 volt = 1 joule / 1 coulomb

Answer 2

Potential difference is the difference in energy of two location.The potential difference between two objects is the work done in moving unit charge from one point to another.