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abamperes air gap alternating current aluminum ampere ampere-hour anode applied armature atoms battery cable capacitance cathode cell cent centimeters charge circuit of Fig coefficient coil condenser conductor connected constant copper core coulomb cross section current flowing curve deflection determine diameter dielectric direct current direction efficiency electrolyte electrons equation expressed field intensity filament flux density force galvanometer gausses grid heat illustrates increased instrument insulation iron joules length load loop loss machine magnetic circuit magnetic field material maximum maxwells measure metallic meter motor negative obtained oersteds Ohm's law ohms output oxide parallel path permeability plate current plate potential potential gradient Prob produced resistance resistor result shown in Fig shunt solenoid statcoulombs statvolts steel supply temperature terminal voltage tion torque transmission tube turns units velocity voltage voltmeter volts watts winding wire zero