The coulomb (symbol: C) is the International System of Units (SI) unit of electric charge. It is the charge (symbol: Q or q) transported by a constant current of one Ampere in one second:

1 C = 1 A 1 s

Thus, it is also the amount of excess charge on a capacitor of one farad charged to a potential difference of one volt:

1 C = 1 F 1 V

It is equivalent to the charge of approximately 6.242×10¹⁸ (1.036×10^?5 mol) protons, and ?1 C is equivalent to the charge of approximately 6.242×10¹⁸ electrons. Wikipedia, Coulomb

See Also

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Coulomb Law Coulomb explosion