Which device measures electrical current in a circuit?

An ammeter is specifically designed to measure the electrical current flowing through a circuit. It operates by being connected in series with the circuit, allowing it to measure the current directly in terms of amperes (A). This device effectively shows how much charge is moving through the conductor over time, which is essential for assessing the performance and safety of electrical systems.

In contrast, a voltmeter measures voltage (the electrical potential difference) across two points in a circuit and is typically connected in parallel. An ohmmeter measures resistance in ohms (Ω), assessing how much current can flow when a voltage is applied. A wattmeter measures power, which is the product of voltage and current, rather than isolating the current itself. Each of these devices has a specialized function, uniquely positioning the ammeter as the instrument for measuring electrical current.