A unit of electric charge in the international system of electrical and magnetic units: the quantity of electric charge which passes any point in a wire in one second when the wire carries a current of 1 international ampere. One international coulomb is approximately 0.99985 absolute coulomb.
For an excellent history of the development of the electric and magnetic units up to 1913, see U. S. Bureau of Standards Circular 60.
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Last revised: 8 March 2008.