## Direct Currents |

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airgap alternating currents ampere-turns amperes armature conductors armature current armature reaction axis brushes cell centimeter characteristic curve charge circuit diagram coil commutator compound condenser connected constant copper cross-section current flows decreases demagnetizing dielectric direct currents direct-current dynamo electric circuit electric current electric energy electrolyte electromotive force electrons equal expressed by equation external characteristic factor field circuit field current field excitation field flux field resistance field winding flux density galvanometer Hence hysteresis loop impressed voltage increase inductance insulation iron lines of force load current losses machine magnetic circuit magnetic field magnetic flux magnetomotive force material mechanical obtained Ohm's law ohms operation pair of poles parallel path permalloy permeability plate positive produced rheostat saturation curve series-field shown in Fig shunt-field solenoid speed steel storage batteries switch temperature terminal voltage tion torque voltage drop volts wave winding wire