The electric charge unit is the coulomb (C). One coulomb is equal to the charge of 6.241 x 10^18 electrons. The coulomb is the standard unit used to measure the amount of electric charge in a given system. It is a fundamental unit in the International System of Units (SI). The coulomb is a measure of how much electric charge moves through a conductor over a given period of time, for example, one second. Electric charge is a scalar quantity, meaning it has magnitude but no direction. It is the measure of how many excess electrons are on a given object.