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An instrument that measures the strength of an electric current, indicating it in amperes. Ammeters typically include a galvanometer; digital ammeters typically include A/D converters as well. Compare ohmmeter, voltmeter.
instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.