What device is used to monitor the electrical system's voltage?

What device is used to monitor the electrical system's voltage?

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

Answer: (A)

Measuring electrical potential difference, or voltage, requires a device specifically designed to sense voltage without drawing significant current from the circuit. That is the voltmeter. It’s connected in parallel across the component or section you want to check, so it measures the potential difference without interrupting the circuit’s operation. Because voltmeters have very high input resistance, they draw only a tiny amount of current, ensuring the reading reflects the circuit's true voltage. In contrast, an ammeter measures current and is placed in series to carry the current through the meter; an ohmmeter determines resistance and is typically used on a de-energized circuit to avoid damage or incorrect readings; a manometer measures pressure and has no relevance to electrical properties.

Measuring electrical potential difference, or voltage, requires a device specifically designed to sense voltage without drawing significant current from the circuit. That is the voltmeter. It’s connected in parallel across the component or section you want to check, so it measures the potential difference without interrupting the circuit’s operation. Because voltmeters have very high input resistance, they draw only a tiny amount of current, ensuring the reading reflects the circuit's true voltage.

In contrast, an ammeter measures current and is placed in series to carry the current through the meter; an ohmmeter determines resistance and is typically used on a de-energized circuit to avoid damage or incorrect readings; a manometer measures pressure and has no relevance to electrical properties.