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accuracy adjustment alternating alternating current ammeter ampere-hour ampere-turns anode anode current applied arrangement balance bridge calibrated capacitance capacitor cathode circuit compensation component condenser connected constant core current coil current transformer curve damping deflection direct current disc effect electrical electrode electrostatic elements equation flux density fluxmeter fraction frequency galvanometer give grid harmonic Hence high-voltage hysteresis impedance indication insulated load loop magnetic field magnetising force measured meter method moving coil moving-iron Mumetal mutual inductance number of turns obtained ohms operating oscillator oscillograph permeability phase difference phase-angle plate pointer position potential potential divider potentiometer power-factor primary proportional range ratio error reactance reading rectifier reduced resistance resonance scale search coil secondary sensitivity shown in Fig shunt sinusoidal specimen speed standard suitable supply switch temperature torque valve voltmeter variable variation vector volt-amperes voltage coil voltage transformer voltmeter watt-hour meter wattmeter waveform winding zero