Which device is used to measure voltage, current, and resistance in electrical circuits?

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

Answer: (B)

The tool that covers measuring voltage, current, and resistance in one instrument is the multimeter. It combines several measurement modes, so you can switch between reading voltage (AC or DC), current (with the meter placed in series in the circuit), and resistance (when the circuit is powered off). This versatility makes it the standard choice for quickly diagnosing and evaluating electrical circuits.

An oscilloscope, while excellent for viewing how voltage changes over time, doesn’t directly report resistance and isn’t used to measure current or resistance in the same straightforward way. A voltmeter reads only voltage, and an ammeter reads only current. Only a multimeter provides all three measurements in a single device, which is why it’s the best answer here.