Characteristics of power electronics devices, power diode, SCR, GTO, power bipolar, power MOSFET, IGBT, characteristics of magnetic material, power transformer core, ferrite core, iron powder core, converters, ac to dc converter, dc to dc converter, cycloconverter, inverter, dc to ac converters, frequency changer, solid state motor drive, direct current motor control, induction motor control, synchronous motor control.