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ELECTRODYNAMIC INSTRUMENTS AIRCORED TYPE
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accuracy adjustment alternating current ammeter ampere ampere-hour amplifier anode anode current applied arrangement balance beam bridge calibration capacitance capacitor cathode circuit compensation component condenser connected constant core current transformer curve damping deflection depends detector direct current disc displacement effect electrical electrode electrodynamic electrostatic equation flux density frequency galvanometer give grid harmonic impedance indication insulated load magnetic field magnetising force means measured meter method movement moving coil moving-coil instrument moving-iron mutual inductance obtained ohms operating oscillator oscillograph phase difference phase-angle plate pointer pole 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 temperature torque triode valve voltmeter variable variation vector volt-amperes voltage coil voltage transformer voltmeter wattmeter waveform Wheatstone bridge winding wire zero