What is a function of a multi-meter?

A multi-meter is a versatile instrument used in electrical testing that can measure voltage, current, and resistance. This functionality makes it an essential tool for electricians, engineers, and technicians working with electrical circuits.

When measuring voltage, the multi-meter can be set to measure the potential difference between two points in a circuit. For current measurements, the device is set up to measure the flow of electric charge through a conductor, which is typically done in series with the circuit. Lastly, it can measure resistance by sending a known current through a resistor and assessing the voltage drop to calculate the resistance according to Ohm’s Law.

This comprehensive capability allows technicians to troubleshoot and verify electrical components, ensuring that installations and repairs are performed correctly. In contrast, options focusing solely on voltage, resistance, or current do not capture the instrument's full range of functionalities, thus highlighting the importance of the correct choice.