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

An ammeter is the appropriate instrument for measuring current in a circuit. It is specifically designed to measure the flow of electric charge, which is expressed in amperes (A). When performing a measurement with an ammeter, it must be connected in series with the circuit so that the current flows through the device. This allows the ammeter to provide an accurate reading of the current flowing in that particular point of the circuit.

The voltmeter, which measures voltage, and the ohmmeter, which measures resistance, serve different purposes and cannot measure current directly. An oscilloscope is used to visualize the waveform of electrical signals and can display voltage over time, but it does not directly measure current like an ammeter does. Each of these devices has its specific function, making the ammeter the only suitable choice for current measurement.