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The ultimate purpose of the present training source was is to provide all hydraulics technicians with enough basic knowledge on electrical/electronic circuits and supplement it with some practical exercises for easier finding and remedy of the failures that may occur in integrated hydraulic and electrical installations/systems. However, we are not intending to make anyone believe that the present publication may enable them immediately start the repair of the electrical equipment straight upon completion of the material provided in its pages. The document has been divided by the authors in the several chapters, with the first one providing the very basic information required to any specialist. The second chapter deals with the electric units - their designation, assigned symbols, abbreviations etc. Then there goes a chapter dedicated to the active and passive components of any electronic hardware, followed by the chapter on the coils and capacitors, describing the capacity, charge and discharge, phase shifts, series and parallel connection, marking and application, speed-up etc; resonance circuits and transformers have also been addressed here. The rest of the chapters in this book deal with the semi-conductors, transistors, operational amplifiers, troubleshooting, and Danfoss hydraulics.