What is 1 coulomb?

One coulomb is a unit of electrical charge, defined as the amount of charge carried by a current of one ampere flowing for one second. It is named after the French physicist Charles-Augustin de Coulomb. One coulomb of charge is equivalent to approximately 6.24 x 10^18 electrons or protons, and is an extremely large quantity of charge in everyday terms. The coulomb is used extensively in electrical engineering and physics, and is a fundamental unit in the International System of Units (SI).