How much 1 coloumb?

One coulomb is defined as the amount of electric charge that is transported by a constant current of one ampere in one second. In terms of elementary charge, one coulomb is equivalent to approximately 6.242 × 10^18 elementary charges (the charge of a single electron is about -1.602 × 10^-19 coulombs). Thus, coulombs are a fundamental unit for measuring electric charge in the International System of Units (SI).