What is the standard unit of electric charge?

The standard unit of electric charge is the coulomb. A coulomb is defined as the amount of charge that is moved by a constant current of one ampere in one second. This unit allows us to quantify electric charge in a consistent way, which is essential for understanding electrical circuits and phenomena.

In the context of the other choices, the volt is the unit of electric potential or voltage, representing the difference in electric potential energy between two points. The ampere is the unit of electric current, measuring the flow of electric charge per unit time. The ohm is the unit of electrical resistance, indicating how much a material opposes the flow of electric current. Each of these units plays a significant role in electrical theory and application, but when specifically addressing electric charge, the coulomb is the appropriate and standard unit.