What is the SI unit of electric charge?
Coulomb
Coulomb is correct.
Electric charge is measured in coulombs, symbol C. One coulomb is the charge carried by a current of one ampere in one second: \(Q = I \times t\), so \(1\,\text{C} = 1\,\text{A} \times 1\,\text{s}\).
The volt is the unit of electric potential difference, the kelvin is the unit of thermodynamic temperature and the kilogram is the unit of mass, so none of them measures charge.
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