Which device would you use primarily to measure electrical current?

To measure electrical current, the device you would primarily use is an ammeter. An ammeter is specifically designed to measure the flow of electric charge in a circuit, quantified in amperes (A). When connected in series within a circuit, the ammeter provides a direct reading of the current flowing through that portion of the circuit. It operates on the principle of measuring the magnetic field generated by the flow of current or the voltage drop across a known resistance.

Other devices serve different purposes: a voltmeter measures electrical potential difference (voltage) across two points in a circuit; an ohmmeter measures the resistance of a component or circuit; and a transformer is used to change the voltage level in AC circuits rather than measuring current. Each of these tools is essential in electrical engineering, but an ammeter is exclusively used for current measurement.