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THE IDEAL ELECTRICAL SYSTEM
ELECTRICAL MEASURING INSTRUMENTS
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3-phase 5-ampere a-c ammeter a-c circuits a-c voltmeters accuracy alternating current ampere-hour amperes amps binding posts burden calibrated cent chart conductors connected current coil current ranges current transformers cycles d-c instrument determined direct current direct-current effective value electrical measuring instruments electrodynamometer electrolysis employed equipment external shunts frequency Frequency Meter ground resistance impedance indicating induction industrial instru instrument transformers insulation resistance lamps load survey maximum Megger megohms ment milliamperes millivoltmeter millivolts Model motor Movable Iron moving system multiplier obtained ohmmeter ohms operation parallel circuit permanent-magnet moving-coil plant pointer polyphase wattmeter potential coils potential transformer power factor primary rated ratio reactance recording instruments resistors secondary self-contained shown in Fig single-phase wattmeters Small Shoe Machines speed struments supply switch synchronous Tachometer Tester thermocouple three-phase three-wire tion usually volt-amperes voltage drop voltage ranges voltage survey Voltmeter Ammeter volts watthour meter wattmeter readings watts wave form Wheatstone Bridge wire zero