Introduction to energy conversion and magnetic circuits. Sources of magnetic flux and magnetomotive force, magnetic materials, hysteresis loop, eddy currents and self and mutual inductances. Single, Auto and three phase transformers construction, principle of operation, regulation, connection and equivalent circuits. DC-machines, construction, types, windings, EMF equation, Torque equation, armature reaction and efficiency. AC-machines, construction, types (synchronous and induction), windings, rotating magnetic field and flux distribution, equivalent circuit and principle of operation as motor and generator