Book excerpt: For students on BTEC National Engineering courses. This textbook covers key points and definitions, highlighting the most important concepts of the 2010 BTEC National course, and hundreds of activities and worked examples help put theory in context. Questions throughout the book allow students to test their knowledge as they go, while end-of-unit review questions are ideal for exam revision and set course work. The companion website includes interactive quizzes and a comprehensive 2D CAD package.