Which device is commonly used to measure voltage in a circuit?

A voltmeter is specifically designed to measure the electrical potential difference, or voltage, across two points in an electrical circuit. When connected in parallel with the component or section of the circuit of interest, the voltmeter provides a direct reading of the voltage, allowing for effective monitoring and diagnostics. It is built to have a high internal resistance to minimize its impact on the circuit being tested, ensuring that it does not affect the current flow or the characteristics of the circuit.

In contrast, the other devices serve different purposes. An ammeter is used to measure the current flowing through a circuit and is typically connected in series. A wattmeter measures the power in a circuit, combining voltage and current readings to determine electrical consumption. An ohmmeter is employed to measure resistance in a circuit or component. Each of these instruments plays an essential role in electrical testing and troubleshooting, but the voltmeter is specifically tailored for voltage measurements.