What is the unit of measurement used to express the flow of electrical current?

The ampere is the unit of measurement for electrical current, which is defined as the flow of electric charge through a conductor. One ampere of current corresponds to one coulomb of charge passing through a given point in a circuit per second. This establishes a direct relationship between current and charge flow, making the ampere a fundamental unit in electrical engineering.

The other units mentioned serve different purposes in the context of electricity. The ohm measures electrical resistance, indicating how much a material opposes the flow of current. The volt represents electrical potential difference, which is the push that drives electric charges to flow in a circuit. Lastly, the coulomb measures electrical charge directly, not current itself. Thus, while all these terms are related to the study of electricity, the ampere specifically quantifies the flow of current.