What does a voltmeter specifically measure?

A voltmeter is designed to measure the electrical potential difference, also known as voltage, between two points in an electrical circuit. This capability is critical in assessing how much energy is available to push an electric current through a circuit.

When connected across two points, the voltmeter provides a reading that tells the technician or electrician how much voltage is present. This measurement is essential for troubleshooting electrical problems, ensuring that equipment operates within its specified voltage range, and confirming the operation of electrical components.

The other options refer to different electrical measurements: current flow is measured using an ammeter, resistance is assessed with an ohmmeter, and electrical power consumption is determined using a wattmeter or through calculations involving voltage and current. Each of these instruments serves a unique purpose, highlighting the specialized function of the voltmeter in voltage measurement within electrical circuits.