Which device can be used to measure electrical current?

An ammeter is specifically designed to measure electrical current in a circuit. When connected in series with a load, it allows for the determination of how much current is flowing through that section of the circuit. This measurement is crucial for various applications, including diagnosing electrical issues, ensuring circuit protection, and optimizing performance in electrical systems.

The other devices listed serve different functions. A voltmeter measures voltage across two points and is connected in parallel with the component whose voltage is being measured. An ohmmeter measures resistance in a circuit and is essential for testing the integrity of electrical components, ensuring they are not damaged or malfunctioning. A wattmeter measures power in watts, combining current and voltage measurements, typically used for determining power consumption in devices. Each of these instruments serves its unique purpose, but only the ammeter is tailored specifically for current measurement.