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alternating current ammeter ampere hours ampere turns arc lamp armature arrangement battery brushes cable capacity carbon cell centimetres charge coil condenser conductor connected constant copper core coulomb current ﬂows current passes deﬁned deﬁnite deﬂection diameter diﬁerent direct current direction discharge distance dynamo dynes earth eﬁect eﬂiciency electricity electriﬁcation electromagnetic unit electrostatic units energy equal ergs external circuit farads ﬁeld magnets ﬁgure ﬁlament ﬁnd ﬁrst ﬁxed ﬂux foot-pounds galvanometer gramme heat hence inch inductive inﬂuence instrument joules lamp latter length lines of force machine magnetic ﬁeld magnetised maximum measured metal motor moving needle negative ohms parallel placed plate positive potential potentiometer poundal practice pressure produced quantity ring rotation shown in Fig shunt soft iron solenoid speciﬁc strength supplied switch temperature terminals tube vertical voltage voltmeter volts vulcanite watt-hour watts per candle wire zero zinc