What term describes a device that can measure voltage, current, and resistance?

• A. Oscilloscope
• B. Ammeter
• C. Multimeter
• D. Power meter

Answer: (C)

Measuring voltage, current, and resistance with one instrument is the job of a multimeter. It offers three core modes: a voltmeter function to read potential difference, an ammeter function to measure current by placing the meter in series with the circuit, and an ohmmeter function to determine resistance by applying a small internal test current and reading the response. This combination makes it a versatile tool for diagnosing circuits, since you can check how much voltage a component has, how much current is flowing, and how resistant the component is, all with the same device.

An oscilloscope, on the other hand, is built to visualize how a voltage changes over time, showing waveforms and timing details rather than providing direct resistance readings. An ammeter focuses on current measurement alone, and a power meter calculates power (and sometimes energy) from voltage and current, often with phase considerations, rather than giving a direct resistance value.