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a-c voltage accuracy alternating current ammeter amperes applied voltage armature balance calibrated chart component connected in series construction control spring copper countertorque crossed-coil current and voltage current coil current flows current transformer cycles d-c instrument damping deflecting torque designed diagram direct current dynamometer dynamometer instrument effect electric electrodynamometer element end device error field coil field current field flux frequency meter full-scale galvanometer heater hence input instru iron vane jewel bearings line current load magnetic field mechanism ment mounted moving coil moving system moving-iron instrument normally ohmmeter ohms Operating Principle output permanent-magnet moving-coil instrument phase angle pivots pointer polarity portable potential coil potentiometer power factor power-factor meter primary detector produced proportional range ratio reactance recording instrument resistance resistor result rotating scale sensitivity shaft shown in Fig shunt single-phase synchroscope telemeter terminals thermocouple three-phase tion torque-balance typical vector voltage measurement voltmeter volts wattmeter watts winding zero