How is voltage measured?

• A. With an ammeter
• B. With a voltmeter
• C. With an ohmmeter
• D. With a thermometer

Answer: (B)

Voltage is measured using a voltmeter, which is specifically designed for this purpose. A voltmeter operates by connecting its probes across two points in an electrical circuit. It is calibrated to measure the electric potential difference between these points, which is expressed in volts.

The key feature of a voltmeter is that it is connected in parallel with the component or circuit segment across which the voltage is being measured. This allows it to accurately determine the voltage without significantly affecting the circuit operation. Understanding how a voltmeter functions is crucial for electrical work, as it ensures that technicians can measure electrical potential effectively and safely.

Using an ammeter or an ohmmeter would not provide voltage readings; an ammeter measures current in amperes and would be connected in series with the load. An ohmmeter measures resistance, which again requires a different connection. A thermometer is used for measuring temperature, which is unrelated to electrical measurements. Thus, the voltmeter is the appropriate tool for measuring voltage.