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15 amps 20 amps 20 ohms 20 volts 3-phase air gap alternating current ampere-hour ampere-turns applied P.D. armature armature current armature resistance assumed back E.M.F. battery cable calories candle-power capacitance cent coil conductor connected in series copper loss coulomb Current flowing current taken cycles per sec dielectric dynes E.M.F. induced efficiency electric flux Electric flux density Energy stored equivalent farads field current field resistance Find flux density frequency ft.-candles full-load gauss heat henry illumination Impedance inductance iron joules joules/sec lagging lamp line current lines/sq luminous flux microfarads midwire motor no-load number of turns ohms ohms resistance P.Ds permittivity phase angle Power absorbed power factor Power input Prelim primary R.M.S. value Reactance Reactive kVA resistor secondary shunt Specific resistance speed standard candle temperature coefficient torque Total ampere-turns total current Total power unit vector diagram Voltage drop volts watts wire