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An ammeter is specifically designed to measure electric current flowing through a circuit. Its primary function is to provide a quick and accurate indication of the current in amperes. This measurement is critical in many electrical applications, allowing technicians to assess the performance and safety of electrical systems.

Unlike measuring AC voltage, reading resistance, or measuring frequency, which are functions of other instruments like voltmeters, ohmmeters, and frequency counters respectively, the ammeter’s focus is solely on current flow. It is typically connected in series with the circuit to ensure that the entire current passes through the device, enabling it to measure the value accurately. Thus, the primary function of an ammeter is to provide an immediate readout of electrical current.