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Coulomb
The coulomb (unit 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:

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

It is equivalent to the charge of approximately ( mol)  protons, and -1 C is equivalent to the charge of approximately  electrons.

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