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An AC ammeter (Alternating Current ammeter) is an instrument used to measure the current flowing in an AC circuit. It displays the magnitude of current in amperes (A) and is specifically designed to measure alternating current, which periodically reverses direction, unlike direct current (DC).
Range: Typically labeled in amperes (e.g., 030A).
Frequency Response: Calibrated for standard power frequencies (50 or 60 Hz).
Internal Resistance: Very low, to minimize voltage drop across the meter.
Safety: Often insulated to handle higher voltages indirectly via CTs.
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