Relationships between power, reactive power and apparent power factor, principle of conservation of power and reactive
power, reactive power absorbed by capacitors and inductors, phasor representation, power factor correction. Analysis of
series and parallel resonant circuits. Transient conditions in RLC circuits, modelling transients.
Three Phase Circuits
Balanced and unbalanced 3 phase circuits, 3 phase phasor representations; power calculations, summation of phase currents;
effects of harmonic components, star to delta transformations.
Magnetic and Electric Theory (overview)
Electric flux, flux density, field strength, motive force, potential difference, field plotting, dielectric strength, example of insulator
dielectric, forces within electric fields, permittivity. Magnetic, flux, flux density, field strength, potential difference, permeability,
magnetic circuits, magnetic materials, saturation affects, B/H curve, magnetic forces between current carrying conductors,
Principle of action, e.m.f equation, magnetic flux paths within the transformer, useful and leakage flux, equivalent circuit for
transformer, efficiency, regulation, transformer tests, types of transformer, K rating.
Motors and Generators
Energy conversion process and energy balance. Synchronous machine and alternator. Induction motors, torque speed
characteristic and slip. Cage and Slip ring motors Split phase and Shaded pole motors, efficiency, physical construction. Direct
current machines, motors and generators, general types of machine, e.m.f equations, speed torque chararacteristics, efficiency
etc. Physical construction of electrical machines e.g. stator and rotor design.