voltmeter

A voltmeter is a tool used to measure the electrical potential difference, or voltage, between two points in a circuit. Think of voltage as the "pressure" that pushes electrical current through wires. The voltmeter is connected across the points you want to test, and it displays the voltage reading. This helps diagnose electrical issues or verify circuit operation. It’s designed to have a very high resistance so it doesn't significantly alter the circuit while taking measurements, ensuring accurate readings without affecting performance.