Electrostatic Potential and Capacitance

What “Electrostatic Potential and Capacitance” begins with

When an external force does work in taking a body from a point to another against a force like spring force or gravitational force, that work gets stored as potential energy of the body. When the external force is removed, the body moves, gaining kinetic energy and losing an equal amount of potential energy. Spring force and gravitational force are examples of conservative forces.