What is the function of a voltmeter in a circuit?

A voltmeter is specifically designed to measure the electrical potential difference, or voltage, between two points in a circuit. It is connected across the component or section of the circuit being measured, allowing it to accurately assess the voltage present. This function is critical in diagnosing circuit behavior and ensuring that components receive the appropriate voltage levels for operation.

When measuring voltage, the voltmeter operates in parallel with the circuit to minimize the impact on the overall current flow, thus maintaining the integrity of the circuit conditions while providing an accurate voltage reading. Understanding voltage is fundamental for analyzing circuit performance and troubleshooting issues, making the voltmeter an essential tool for anyone working with electrical systems.