What does an ammeter measure?

An ammeter measures the current flow in a circuit. Current, measured in amperes (A), is the rate at which electric charge flows through a conductor. An ammeter is connected in series within the circuit to accurately measure how much current is flowing. By understanding this fundamental electrical parameter, technicians can determine if components are operating within their specified current limits, which is essential for troubleshooting and ensuring the safe and efficient operation of electronic systems.

Measuring voltage, resistance, or frequency involves different instruments. Voltmeters measure voltage, ohmmeters assess resistance, and frequency counters analyze the cycles of a waveform. Each of these measurements requires distinct approaches and methods tailored to the specific electrical characteristic being evaluated. If a technician is tasked with understanding the overall performance of an electrical circuit, knowing the current flow provides critical insight into its functionality.