What unit is used to express electrical charge?

The unit used to express electrical charge is the coulomb. The coulomb is defined as the amount of charge transported by a constant current of one ampere in one second. This makes it a fundamental unit in the study of electricity, as it quantifies the total charge, which is crucial for understanding electric circuits and phenomena.

When considering the context of electrical measurements, amperes refer to the unit of electric current, which measures the flow of charge, but does not express the quantity of charge itself. Volts measure electric potential or voltage, which represents the potential energy per unit charge, while ohms are a measure of electrical resistance. Thus, in the framework of electrical charge, the coulomb is the correct unit, as it directly addresses the amount of electric charge in a system.