Which device is used to measure electrical current in a circuit?

The ammeter is the correct device for measuring electrical current in a circuit. It is specifically designed to measure the flow of electric charge, which is expressed in amperes (A). When connected in series with a circuit, the ammeter allows the current passing through it to be displayed on its scale, providing a direct measurement of the current in that part of the circuit.

While the voltmeter measures voltage and the ohmmeter measures resistance, both of these devices serve different purposes. The multimeter can also measure current, voltage, and resistance, but in the context of directly identifying a device specifically designed for measuring current, the ammeter is the most appropriate choice. Therefore, the ammeter is essential for anyone looking to assess current levels within an electrical system.