William Stanley This great inventor of western Massachusetts was not only a pioneer of early AC power but developer of both magnetic coil driven ammeters and static plate volt/ammeters. He developed phase indicators, static ground detectors, volt meters and other devices to go with this AC system. read more
Ammeter, 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. read more
An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters. read more