This textbook for courses in electrical principles, circuit theory, and electrical technology takes students from the fundamentals of the subject up to and including first degree level. The coverage is ideal for those studying engineering for the first time as part of BTEC National and other pre-degree vocational courses, especially where progression to higher levels of study is likely, as well as Higher Nationals, Foundation Degrees and first year undergraduate modules.The emphasis is firmly on learning by example: 800 detailed worked problems give a thorough understanding of the principles 1,000 further problems within 175 exercises to work through and test learning (answers provided) 14 revision tests which can be used as assignments (answers available to lecturers only) Learning objectives are summarised at the beginning of each chapter Summaries of main formulae used