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adí air gap aluminum disc ampere ampere-hour meter arithmetic-sum braking effect circuit current circuit voltage cost of supply cross-section current circuit DATA dial 30 drum eddy currents edí Electricity Meters field flux friction gearing hour meter induced currents INDUCTION WATT-HOUR METER inherent errors instant KILOVOLT-AMPERE-HOUR METERS kilowatt-hour KVA-hour lag coil lags the circuit line-to-neutral voltage magnetic circuit magnetic flux magnetization curve maximum demand meter meter disk meter records number of revolutions number of turns obtained permalloy magnet phase angle potential coil power component power factor produced reactive meter reactive power retarding torque running cost series coil shaded pole shading coil short circuit shown by Fig shunt silicon steel magnet sphere square standard watt-hour meter sun wheel supplying wattless component Tariff torque is proportional Trivector Triveotor University of Washington vector vector-sum Volt-Ampere Meters volt-ampere-hour meter voltage flux wheel whioh zero