iv The following changes have been made to the eleventh edition of Electricity to strengthen the integrated learning solution and to remain up to date on the latest technology. • Chapter 1: Safety is a new chapter that includes basic safety procedures in a lab setting. It also includes sections on electrical lab safety and soldering safety. • Chapter 9: Series-Parallel Circuits moves combination circuits from the Parallel Circuits chapter for easier use. This new chapter builds on series and parallel circuit concepts and gives students more practice with these circuits. • Chapter 21: Radio and Wireless Technology is a new chapter that introduces basic concepts of radio technology and transitions into current wireless technology. • Figures have been updated to show newer technology and to help students make real-world connections with chapter concepts. • End-of-Chapter material has been strengthened by the additions of a Summary and Critical Thinking Questions and Activities, which help extend learning through higher-order thinking skills and hands-on activities. New to This Edition Reviewers The authors and publisher wish to thank the following industry and teaching professionals for their valuable input into the development of Electricity. Andrea Blaylock Triton College River Grove, IL David Butler BCLUW High School Eldora, IA Larry Flatt Motlow College McMinnville, TN David T. Gluckner Cleveland High School Cleveland, TN Steven Kavli Richardson High School Richardson, TX Maciej Krolikowski Triton College River Grove, IL Kyle Marsh Frontier High School Chalmers, IN Gregg Maseberg Macksville High School Macksville, KS Ken Ramey Wake Technical Community College Raleigh, NC Dennis C. Reed Westside Tech Winter Garden, FL Hannah Reisdorf Moorhead High School Moorhead, MN Clint Rosson South Kitsap High School Port Orchard, WA Debbie Tawzer Legend High School Parker, CO Peter Welty Lake Washington Institute of Technology Kirkland, WA Don Wilcher Lawrence County Center of Technology Moulton, AL