What is the SI unit of electric charge?

The SI unit of electric charge is the Coulomb. It is defined based on the electrostatic force between two charges. More specifically, one Coulomb is defined as the amount of charge that is transported by a constant current of one ampere in one second. This makes it a fundamental unit in the study of electricity and electromagnetism, reflecting the relationship between charge, current, and time.

Other options, such as Volts, Amperes, and Ohms, are indeed related to electric phenomena but represent different aspects. Volts measure electric potential (voltage), Amperes refer to the flow of electric current, and Ohms quantify resistance in a circuit. Each of these units plays a critical role in electrical theory, but none of them represent electric charge itself, which is specifically defined as Coulombs.