When measuring voltage in the circuit example, which instrument displays the reading?

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

Answer: (A)

Measuring voltage needs an instrument with high input impedance that can display the potential difference without loading the circuit. A digital volt-ohm meter (DVOM) is built for this purpose: it measures voltage and shows the value on a clear digital display, while its high input impedance minimizes any effect on the circuit being tested. The other tools aren’t used for this reading in the same way—an ammeter is for current (placed in series and can alter the circuit), an ohmmeter checks resistance (usually with the circuit powered down), and a general multimeter can measure voltage but the device referenced in this context is the DVOM, which is specifically the tool used to display voltage readings in such circuits.