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

The multimeter is a versatile tool widely used to measure various electrical parameters, including voltage, current, and resistance within a circuit. When measuring voltage, the multimeter is connected in parallel to the component or circuit section being analyzed. This allows it to measure the potential difference without interfering with the circuit's operation.

While other tools like an ammeter, ohmmeter, and wattmeter serve specific functions, they do not measure voltage directly. An ammeter is designed to measure current and must be connected in series with the circuit. An ohmmeter measures resistance and is typically not used in live circuits because it needs to measure the resistance without current flowing. A wattmeter, on the other hand, measures electrical power, and while it can provide voltage and current readings, its primary function is not to measure voltage alone. Thus, the multimeter's capability to perform various measurements, including voltage, makes it the most appropriate tool for this task.