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ELECTRODYNAMIC INSTRUMENTSAIRCORED TYPE
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accuracy adjustment alternating current ammeter ampere-hour amplifier anode anode current applied voltage balance beam bridge calibrated capacitance capacitor cathode circuit compensation component condenser connected constant core current transformer curve damping deflection depends detector direct current disc displacement effect electrical electrode electrostatic equation flux density frequency galvanometer give grid harmonic high-voltage impedance indication insulated load magnetic field measured meter method movement moving coil moving-coil instrument moving-iron Mumetal mutual inductance obtained ohms operating oscillator oscillograph phase difference phase-angle plate pointer position potential potential divider potentiometer power-factor primary proportional r.m.s. value range ratio arms ratio error reactance reading rectifier resistance resonance scale screen search coil secondary sensitivity shown in Fig shunt slide-wire standard suitable supply switch symmetrical components temperature torque triode valve voltmeter variable variation vector volt-amperes voltage coil voltage transformer voltmeter wattmeter waveform Wheatstone bridge winding wire zero