# Difference between electric potential energy and electrostatic potential energy?

We know that electrical potential energy is the work done in bringing a set of charges from infinity to a point opposite to electric field.

And in electrostatic potential energy there is only one difference that here it is only one positive charge not a set.

My question is that how their units are same, i.e. volt.

According to me volt is the SI unit of the electrostatic potential energy as one volt is work done per unit charge. So there is one unit charge not so many, so we should not consider electrical potential energy.

• Electrostatic potential energy requires tw0 charges. Mar 14, 2017 at 12:43
• @garyp an electric charge in an electric field has potential energy? so having two charges is not a necessary condition. Mar 14, 2017 at 13:13
• @YashasSamaga Charges are necessary for the production of that electric field. Generally, every type of potential energy requires (by definition) an interaction between two objects. It's possible to ignore this fact, and most introductory presentations do ignore it. For example, the earth is usually not explicitly mentioned in discussions of gravitational potential energy. However this causes conceptual difficulty for novices with regard to choosing a system and energy accounting. E.g. distinguishing between potential energy, internal work, and external work. Mar 14, 2017 at 15:07

The is no difference between electrostatic potential energy and electric(al) potential energy.

I think that you are mixing up electric potential energy of a system of changes and the electric potential at a point.

The electric potential energy of a system of charges is the work done by an external force in moving the charges (two or more) to a new set of positions which initially started in an arrangement which was defined to have zero electric potential energy (often all the charges starting at infinity).
The unit of electric potential energy is the joule.

The electric potential at a point is the work done by an external force in moving unit positive charge from an arbitrarily chosen zero of potential (often infinity) to the point.
The unit of electric potential is the volt (=joule/coulomb).

• But farcher please see a video on YouTube named examfear electrostatic potential part 6 and 7. Mar 15, 2017 at 8:56
• @ShobhitSwami The videos are about electrostatic potential not electrostatic potential energy. Mar 15, 2017 at 9:01
• Difference between them @electrostatic potential ,electrostatic potential energy and electric potential and electric potential energy. Please Farcher its urgent . Mar 15, 2017 at 16:48