What is the SI unit of electric charge?

The SI unit of electric charge is the coulomb. This unit is named after Charles-Augustin de Coulomb, a pioneer in the field of electrostatics. One coulomb is defined as the amount of electric charge transported by a constant current of one ampere in one second. This relationship highlights how charge is fundamentally related to current and time, making the coulomb a critical unit in understanding electrical phenomena.

The other options represent different electrical concepts: the volt is the unit of electric potential, the ampere is the unit of electric current, and the ohm is the unit of electrical resistance. While all these units are essential in the study of electricity, they measure different properties and are not applicable to electric charge, making the coulomb the definitive answer.