Which instrument is used to measure potential difference?

Which instrument is used to measure potential difference?

• A. Ammeter
• B. Ohmmeter
• C. Voltmeter
• D. Multimeter

Answer: (C)

Potential difference, or voltage, is measured with a voltmeter. It is connected in parallel across the two points where you want the voltage, and its high internal resistance ensures it draws little current so the circuit isn’t significantly altered. This setup lets the instrument read the exact electric pressure between those points. In contrast, an ammeter measures current and is placed in series with a circuit, ideally having very low resistance to avoid dropping voltage. An ohmmeter measures resistance by applying a small current and is used when the circuit is unpowered. A multimeter can measure voltage, current, and resistance, but the device dedicated to measuring potential difference is the voltmeter.

Potential difference, or voltage, is measured with a voltmeter. It is connected in parallel across the two points where you want the voltage, and its high internal resistance ensures it draws little current so the circuit isn’t significantly altered. This setup lets the instrument read the exact electric pressure between those points. In contrast, an ammeter measures current and is placed in series with a circuit, ideally having very low resistance to avoid dropping voltage. An ohmmeter measures resistance by applying a small current and is used when the circuit is unpowered. A multimeter can measure voltage, current, and resistance, but the device dedicated to measuring potential difference is the voltmeter.