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- noun a unit of electric charge, being the amount of electricity conveyed in one second by a current of one ampere.
- The SI unit of electric charge. One coulomb is the charge that passes through a given cross section of a conductor with a constant current flow of one ampere, for an interval of one second. It is equal to the charge contained in approximately 6.2415 × 1018 electrons. Its abbreviation is coul, and its symbol is C.