What does a multimeter measure?

A multimeter is a versatile measuring instrument that can assess multiple electrical parameters, which is why the correct answer is that it measures voltage, current, and resistance. It typically includes a digital display and is equipped with various settings that allow users to select what they want to measure.

When measuring voltage, the multimeter is connected across two points in a circuit, providing a reading of the potential difference. For current measurements, the multimeter is incorporated in series with the circuit to measure the flow of electric charge. Additionally, when measuring resistance, the multimeter sends a small current through a component and calculates the resistance based on the voltage drop across it.

This multifunctionality makes multimeters valuable tools for troubleshooting and diagnosing electrical circuits, as they provide comprehensive information about the circuit's performance. Other answer choices that limit the functionality to only one or two parameters do not accurately represent what a standard multimeter can do, therefore highlighting why the correct answer encompasses all three measurements.