Which of the following SI units measures electric current?

The correct answer is the ampere, which is the SI unit for measuring electric current. The ampere is defined as the flow of electric charge through a conductor when one coulomb of charge passes through a cross-section of the conductor in one second. It is a fundamental unit in the International System of Units (SI) and is crucial for electrical engineering and physics, as it quantifies how much electricity is flowing in a circuit.

In contrast, Kelvin measures temperature, the mole quantifies the amount of substance, and the newton measures force. Each of these units serves a specific purpose in scientific measurements and none pertain to electrical current, making the ampere uniquely relevant in this context. Understanding the ampere is essential for power engineers, as it directly relates to circuit design and analysis in electrical systems.