One of nature's most spectacular display of electricity is the lightening observed during a thunder storm. Electricity originates from electric charges. All material bodies are known to possess electric charges.
Electrons carry negative charges while protons carry positive charges in the nucleus of an atom.
The unit of charge is Coulomb. The force exerted by electric charge is described by the Coulomb's law of force. The force is attractive between unlike charges and repulsive between like charges. The force between two charges is directly proportional to the product of the two charges, and inversely proportional to the square of the distance between the two charges. The force on each charge is equal in magnitude but opposite in direction.