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accuracy adjustment alternating anode anode current applied arrangement balance beam bridge calibrated capacitance carrying causes cent characteristics circuit coil compared compensation component connected constant construction convenient core curve damping deflection depends determined difference direct disc divider earth effect electrical electrons element employed equal equation error factor field flux force frequency galvanometer give given grid harmonic Hence impedance increase indication inductance instrument known leads limited load magnetic material means measured meter method movement moving necessary negative obtained operating oscillator phase plates position possible potential potentiometer power-factor practice primary principle proportional range ratio reading reduced represents resistance resonance scale screen secondary sensitivity sequence shown shunt speed standard suitable supply switch takes temperature torque transformer turns units usually valve variable variation voltage voltmeter wattmeter winding zero