This digital student book offers comprehensive coverage of the Cambridge Advanced National in Engineering Unit F137: Electrical devices and circuits. Mapped to the OCR specification, this book has been designed to help students and teachers build the confidence, knowledge and skills needed to succeed in the new qualification. Ideal as both a learning and reference tool, it is structured to follow the order of the specification and unpack its content in an easy-to-follow, digestible way. It will help students learn key concepts and information, while providing teachers with guidance on the breadth and depth of content they're required to teach. Written by Sarah Varley, an experienced teacher and practitioner, this book will help students apply circuit theory and electronics to design, build and test electronic circuits. It will support students to use their maths skills and knowledge of electrical principles to evaluate direct and alternating current circuits, and analogue and digital systems. As well as this, they’ll learn to apply their knowledge of semiconductor physics to build, test and analyse circuits for a range of applications. The book also explores how devices such as smartphones, laptops, household appliances and automotive systems have become an essential part of modern living, and how engineers must have a knowledge of electronics and circuit theory to develop them. This book is written to be engaging and motivating. “Learning in Context” examples help students relate the concepts they are learning to the real world, and worked examples guide their development of essential skills, step-by-step. Furthermore, frequent quick-check questions help them to assess their progress and understanding of each topic. The flexible digital format means content can be accessed anywhere, at anytime. We are working towards endorsement by OCR.