Quantity of electricity that flows in
It occurs in discrete natural units, equal to the charge of an {{link=electron">electron or proton . It cannot be created or destroyed. Charge can be positive or negative; one positive charge can combine with one negative charge, and the result is a net charge of zero. Two objects that have an excess of the same type of charge repel each other, while two objects with an excess of opposite charge attract each other. The unit of charge is the coulomb, which consists of 6.24 × 10 18 natural units of electric charge.