This book includes my lecture notes for power electronics course course. The characteristics and operation of electronic power devices, firing circuits, and driving circuits for power converters are described and implemented practically in the laboratory. Uncontrolled and controlled, single phase rectifiers are used in various electrical power applications. DC to DC power conversion circuits are investigated. Circuit simulation and practical laboratories are utilized to reinforce concepts. The book is divided to different learning parts • Part1- Describe the characteristics and operation of electronic power devices. • Part2- Describe firing and driving circuits for power electronic converters. • Part3- Analyse the use of uncontrolled and controlled single-phase rectifiers in various electrical power applications. • Part4- Investigate the DC-to-DC power conversion circuits used in power applications.