What does a voltmeter measure in a circuit?

A voltmeter is specifically designed to measure the electrical potential difference, commonly referred to as voltage, between two points in an electrical circuit. The measurement is expressed in volts (V), which quantifies the amount of energy per unit charge available to drive electric current through the circuit.

Understanding the significance of voltage is crucial as it influences how electrical energy is distributed and utilized in circuits. For instance, in an elevator system, accurate voltage measurements are essential for ensuring that the control panels and motors function correctly. A voltmeter connects in parallel with the circuit component or section being tested, allowing it to provide a direct measure of the potential difference without disrupting the flow of current.

Measuring electric current, resistance, or power consumption involves different devices: ammeters for current measurement, ohmmeters for resistance, and wattmeters for power. These distinctions are important in electrical work, as each measurement serves a unique purpose in troubleshooting and maintaining electrical systems.