Which unit is commonly used to measure electrical current?

The unit commonly used to measure electrical current is amps. Amps, or amperes, quantify the flow of electrical charge in a circuit. Specifically, one ampere represents one coulomb of charge passing through a defined point in a circuit in one second. This measurement is crucial in understanding how much electricity is flowing, which is essential for designing and evaluating electrical systems and components.

In the context of electricity, volts measure the electrical potential (or voltage) that drives the current, ohms quantify resistance to that current, and watts measure electrical power, which is the product of current and voltage. Each of these units serves a different purpose in electrical engineering and does not measure current directly, making amps the correct choice for this question.