What does a voltmeter measure?

A voltmeter measures voltage, which is the electrical potential difference between two points in a circuit. Voltage is an indication of the potential energy per unit charge available to drive an electric current through a circuit. When you connect a voltmeter across two points in a circuit, it displays the amount of voltage present, allowing you to determine whether a circuit is operating within its expected voltage range.

In practical terms, using a voltmeter helps in diagnosing electrical issues by confirming whether components are receiving the appropriate voltage necessary for their operation. Understanding voltage is crucial for anyone working with electrical systems, as it helps ensure that devices function correctly and safely.