What does a voltmeter measure?

A voltmeter is specifically designed to measure the voltage, or electrical potential difference, between two points in an electrical circuit. It is connected in parallel with the component or section of the circuit where voltage is to be measured. The value displayed by the voltmeter indicates the amount of electrical potential energy per unit charge available at that point in the circuit. Understanding this measurement is crucial for diagnosing circuit behavior, ensuring proper voltage levels, and troubleshooting.

The other choices reflect different measurements that are not within the scope of a voltmeter's function. For example, a device that measures current would be an ammeter, and resistance is measured with an ohmmeter. Power consumption, which refers to the rate of energy transfer or conversion, can be calculated using voltage and current readings but is not measured directly by a voltmeter. This distinction is essential for anyone studying electrical principles or working in the field.