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Introduction and history
Elements of magnetism
Electromagnetism and electromagnetic induction
12 other sections not shown
a-c coils a-c supply voltage a-c voltage a-c windings ampere amplidyne armature B-H curve bar magnet basic bias winding center-tapped characteristics circled polarity conductor connected in series control circuit control current control signal control voltage control winding control winding Nc core saturation cycle d-c control voltage d-c load decreases determined device direct current effect electromotive force electrons flow external magnetizing feedback magnetic amplifier feedback windings ferromagnetic flux density flux produced force H full-wave half-cycle hysteresis illustrated in Fig impedance increases input internal feedback kilogauss lines of force load resistance load RL load voltage load winding Nl magnetic field magnetic flux magnetizing force magnetomotive force magnitude negative netic amplifier number of turns oersted ohms output voltage permeability positive potentiometer power gain push-pull magnetic amplifier rectifier SRi resistor result saturable reactor secondary servomechanism shown in Fig solenoid supply frequency synchro thyratron transformer variations voltage appears voltage is applied Wheatstone bridge zero