However, whereas gravitational forces between bodies depends on the mass, electric forces depend on electrical charge. Charge is a basic property of all matter. It may be positive, as in the charge associated with a proton, or negative as in the electron. All matter is comprised of protons and electrons. It is the electric force between protons and electrons in the atom that holds it together.
Electrical current is the flow of electric charge.
Electric currents are present in all aspects of our everyday life, from light bulbs, heaters, radios, televisions, cars, computers, and in all biological systems. In order for an electrical current to flow in a body, a difference in electrical potential must exists in it. Electric potential is similar to gravitational potential. When an electric charge moves from a higher electric potential to a lower one, it cause a flow of charge, an electric current. An electric potential difference is therefore needed to cause an electric current.