In electrical systems, what does current measure?

Current measures the intensity of electron flow within an electrical system. It quantifies how much electric charge is flowing through a conductor over a specified period, typically measured in amperes (A). This is fundamental in understanding how electricity operates in circuits, as current directly affects the performance of electrical devices and systems.

By focusing on the movement of electrons, which are the charged particles in a conductor, current serves as a vital measure for determining the flow of electrical energy and the overall health of an electrical system. This property of current influences various aspects, such as resistance and voltage, and is critical for troubleshooting and designing electrical circuits.

In contrast, the other options refer to different electrical characteristics: storage of electrical energy pertains to capacitance, voltage levels measure the potential difference between two points, and magnetic field strength relates to electromagnetism, not the flow of electric charge. Understanding current as electron flow thus establishes a foundational concept essential for working effectively with electrical systems.