- noun the SI unit of electric charge equal to the amount of electrical charge transported by a current of one ampere in one second.
- 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.
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