This text considers the physical operation of devices, the basics of semiconductors and PN Junction, bipolar junction transistor operation and MOSFET operation. The result is a gradual introduction to these ideas within the context of their importance where they are needed. First published in 1982, this text offered a different way to teach electrical engineers about electronic circuits. This fourth edition has been extensively revised and includes information on devices and circuits, analogue circuits and digital circuits. An intructor's manual with transparency masters is available free of charge with this text (0-19-511769-7).