Which device is used to measure voltage in a circuit?

The device used to measure voltage in a circuit is the voltmeter. This instrument is specifically designed to measure the electric potential difference between two points in an electrical circuit. By connecting the voltmeter in parallel to the circuit component across which the voltage is to be measured, it allows for accurate readings of the voltage level.

A voltmeter typically has high internal resistance to prevent it from drawing significant current from the circuit, which could otherwise alter the voltage being measured. This ensures the readings reflect the true operating conditions of the circuit.

In contrast, an ammeter measures current, an ohmmeter measures resistance, and a wattmeter measures power, each serving distinct purposes in the field of electrical measurements. Understanding the specific function of each device is essential for effective circuit analysis and troubleshooting.