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a.c. circuit a.c. supply alternating current amperes anode applied armature battery calculated capacitive reactance capacitor cathode cell charge carriers circuit in Figure coil complex number conductor connected current ﬂows d.c. motor deﬂection dielectric diode direct current direction eddy current effect efﬁciency electrical circuit electrolyte electrolytic capacitors electromagnet electrons element energy equation example farads ﬁeld intensity ﬁlm ﬁrst ﬁxed Fleming’s flux ﬂux density force frequency induced e.m.f. inductive reactance inductor instrument iron known load loop machine magnetic circuit magnetic ﬁeld magnetic ﬂux magnetising material measured mid-ordinates N-pole negative Ohm’s law ohms output p-type p-type semiconductor parallel permittivity phase angle phasor phasor diagram plates potential power consumed power factor power loss produced r.m.s. value rectiﬁer resistance resistor resonant reverse rotating rotor semiconductor series circuit shown in Figure sinewave single-phase supply voltage switch symbol temperature terminal three-phase thyristor transformer triac volt-ampere wave waveform winding wire zero