Which device measures voltage, current, and resistance in an electrical circuit?

The correct answer is a multimeter. A multimeter is a versatile instrument that combines multiple measurement functions into one device, allowing it to measure voltage, current, and resistance. It is an essential tool in electronics and electrical work because it can provide crucial information about a circuit's performance.

When measuring voltage, a multimeter allows you to assess the potential difference across two points in a circuit, enabling you to diagnose voltage levels and detect any issues. For current measurements, it can be set to measure the flow of electrons through a conductor when connected in series with the circuit. Lastly, when measuring resistance, it helps determine the opposition to current flow within a component by applying a known voltage and measuring the resulting current.

Other devices listed, such as an oscilloscope, function generator, and frequency counter, are specialized tools that serve different purposes in electrical testing and signal analysis. An oscilloscope visualizes waveforms in time, which helps in analyzing signal behavior rather than directly measuring basic electrical parameters. A function generator produces various types of electrical signals for testing, and a frequency counter measures the frequency of signals. However, none of these devices can measure voltage, current, and resistance like a multimeter can. This versatility makes the multimeter an indispensable tool