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CHAPTER VIIELECTROSTATIC AND THERMAL INSTRUMENTS
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accuracy adjusted alternating current ammeter ampere-hour ampere-turns amperes angle anode apparatus balance ballistic galvanometer battery bridge cable calibrated capacitance cell circuit comprises condenser conductor connected constant core cycles per second damping deflection dial direct current disc dynamometer earth electrical electrodes electrostatic voltmeter equal error flux frequency full scale galvanometer indicating instrument instru insulation resistance lamp load magnetic field magnetising maximum means measured megohms ment metal rectifier meter method metre milliammeter milliamperes movement moving coil instrument moving iron instrument mutual inductance necessary null obtained ohmmeter ohms overload peak permanent magnet photometer pivots pointer possible potential divider potentiometer power factor practice proportional pyrometer r.m.s. value range ratio reactance reading rectifier instrument sensitivity series resistance shows shunt slide wire small currents standard sub-standard suitable supply switch temperature thermal thermo-couple torque units usually valve variable varying volt-amperes voltage voltmeters and ammeters volts wattmeter wave-form Wheatstone bridge whilst winding zero