Which instrument is used to measure electric current?

An ammeter is specifically designed to measure electric current in a circuit. It works by being connected in series with the circuit component you want to measure. The device measures the flow of electric charge, which is expressed in amps (A).

When using an ammeter, it is important to ensure that its range is appropriately set to avoid damage and to obtain accurate readings. The construction of an ammeter allows it to have a very low internal resistance, which minimizes its impact on the circuit and ensures that it does not significantly alter the current being measured.

In contrast, an ohmmeter measures resistance and is not suitable for measuring current directly. An electrometer is used for measuring electric charge or very small currents, typically in sensitive applications, and is not the standard instrument for current measurement. A voltmeter measures the potential difference (voltage) between two points in a circuit rather than the current itself. Thus, the use of an ammeter is essential and appropriate for current measurement.