What is the SI unit for electric current?

The SI unit for electric current is the Ampere. It is defined as the flow of electric charge in a circuit. More specifically, one Ampere corresponds to a flow of one coulomb of charge per second. The concept of current is fundamental in electrical engineering, as it directly relates to the movement of electrons through a conductor, which in turn enables the functioning of various electronic devices and electrical systems.

Understanding the Ampere is essential for analyzing circuits, calculating power, and designing electrical systems. This unit is also critical when applying Ohm's Law, which relates current, voltage, and resistance. In contrast, the other options represent different electrical concepts: voltage (measured in Volts) is the potential difference that drives current; resistance (measured in Ohms) opposes the flow of current; and power (measured in Watts) is the rate at which electrical energy is consumed or converted. Each of these units plays a vital role in the broader context of electrical engineering, but the Ampere specifically quantifies electric current.