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alternating current ammeter ampere angle anode armature atom attraction back e.m.f. battery Calculate called capacitance capacitor carrying current cathode cell charge coil conductor connected copper core coulomb cross-section current flows curve Daniell cell deflection diameter dielectric direction drop dynamo earth effect electric circuit electric current electrification electrolyte electrons electroscope electrostatic energy equal example experiment external farad flux density force acting full-load galvanometer gives graph heat Hence hydrogen induced e.m.f. instrument insulated internal resistance ions iron joules junction length lines of force machine magnetic circuit magnetic field magnetic flux magnitude material metal metre molecules motion motor moving negative newton-metres newtons no-load north pole ohms parallel particles plates positive potential proportional quantity resistor resultant shown in Fig shows shunt solenoid specific resistance supply switch temperature terminal p.d. torque turns unit voltage voltmeter volts winding wire zero zinc