What does a multimeter measure in an electrical circuit?

A multimeter is an essential tool used in electrical circuits for measuring several critical parameters. The correct choice highlights its capability to measure voltage, current, and resistance.

When a multimeter is set to measure voltage, it can measure both AC and DC voltages, providing crucial information about the electrical potential difference in a circuit. For current measurement, the multimeter can measure the flow of electric charge through a conductor, again for both AC and DC currents, depending on the multimeter's settings and capabilities. Additionally, when measuring resistance, the multimeter sends a small current through the component or circuit and measures how much the current is opposed, which allows for the calculation of resistance in ohms.

While other types of measurements, such as capacitance, frequency, and duty cycle, are important in electronics, they are typically features of specialized multimeters or different test instruments, making them less commonly available in a standard multimeter. Therefore, the broad measurement capabilities of voltage, current, and resistance provide a comprehensive understanding of the electrical circuit being assessed.