What is the primary function of an ammeter in a circuit?

An ammeter is specifically designed to measure the flow of electric current in a circuit. The primary function of this instrument is to quantify the amount of current, which is expressed in amperes (A). When placed in series within a circuit, the ammeter allows for accurate readings of the current passing through that point in the circuit. This is essential for diagnosing issues, ensuring that components are operating within their safe limits, and monitoring overall circuit performance.

In contrast, other choices focus on different measurements: measuring resistance is the function of an ohmmeter, measuring voltage is the role of a voltmeter, and measuring power typically requires more complex calculations based on voltage and current readings. Each of these instruments has its own distinct purpose, which highlights the specialized role of the ammeter in electrical circuit analysis.