What does a multimeter primarily measure in electrical circuits?

A multimeter is an essential tool in electrical diagnostics and primarily measures three fundamental electrical properties: voltage, current, and resistance. Each of these measurements plays a crucial role in assessing the health and functionality of electrical circuits.

Voltage measurements allow technicians to determine the electrical potential difference between two points in a circuit, which is critical for diagnosing issues like open circuits and measuring the supply voltage to electrical devices.

Current measurements enable the assessment of how much electrical charge is flowing through a circuit, essential for understanding load conditions and verifying the proper operation of an electrical system.

Resistance measurements help in identifying problems such as short circuits, open circuits, or faulty connections by indicating how much the circuit resists the flow of electric current.

While other options mention measurements such as power and frequency or energy efficiency, these are not the primary functions of a multimeter. Power and frequency are typically measured using other specialized instruments, and static electricity involves different principles that a standard multimeter is not designed to measure comprehensively. Thus, the primary function of a multimeter revolves around the three core parameters of voltage, current, and resistance.