What tool is used to measure voltage, current, and resistance in circuits?

The tool that measures voltage, current, and resistance in circuits is a multimeter. This versatile instrument can be set to different functions to measure each of these electrical parameters.

When measuring voltage, the multimeter is connected in parallel with the component or circuit being tested. For current measurement, it is placed in series, allowing the flow of electrons through the meter. When set to measure resistance, an internal battery in the multimeter applies voltage to the component, and the meter calculates the resistance based on the resulting current flow.

This multifunctionality makes the multimeter an essential tool for electricians and technicians, as it consolidates multiple measurement capabilities into one device, streamlining the troubleshooting and testing process. Other tools mentioned may measure specific parameters but do not offer the comprehensive range that a multimeter provides.