Which device is used to measure electrical current?

An ammeter is specifically designed to measure electrical current in a circuit, typically expressed in amperes (A). When connected in series with the circuit, the ammeter allows current to flow through it, enabling it to measure the flow of electric charge in that path. This device is calibrated to provide accurate readings of current, making it essential for understanding how much current is being drawn by various components in a circuit.

In contrast, a voltmeter measures voltage (the electrical potential difference between two points), an ohmmeter assesses electrical resistance in a component or circuit, and a wattmeter indicates the power (in watts) consumed or produced by an electrical device. Each of these measuring instruments serves distinct functions in the field of electronics and electrical engineering, emphasizing the importance of using the correct device based on the parameter you wish to measure.