What device is used for measuring electrical current?

An ammeter is specifically designed to measure electrical current in a circuit. It operates by being connected in series with the circuit load, allowing the flow of electric charge to pass through the device. The amount of current flowing through the circuit is then displayed on the ammeter's scale, usually measured in amperes (A).

In contrast, a voltmeter measures the potential difference (voltage) between two points in a circuit and is connected in parallel with the circuit elements. A galvanometer can also measure current but is generally used for small currents and can be sensitive, often requiring calibration to provide accurate readings. An ohmmeter measures resistance in ohms and is not applicable for measuring current directly. Therefore, the ammeter is the correct choice for measuring electrical current due to its design and functionality.