As electric potential is lost or gained, work is done changing the energy of some system.
The amount of work in joules is given by the product of the charge that has moved, in coulombs, and the potential difference that has been crossed, in volts.
The fundamental principle of electricity generation was discovered during the 1820s and early 1830s by the British scientist Michael Faraday.
His basic method is still used today: electric current is generated by the movement of a loop of wire, or disc of copper between the poles of a magnet.
[3] Electricity is most often generated at a power station by electromechanical generators, primarily driven by heat engines fueled by chemical combustion or nuclear fission but also by other means such as the kinetic energy of flowing water and wind.