This extensively revised 4th edition of an established physics text offers coverage of the recent developments at A AS-Level, with each topic explained in straightforward terms, starting at an appropriate Level (7 8) of the National Curriculum. The format has been updated, with new consolidation sections and questions in the text designed to provide a link between GSCE and A-Level. At the end of each section are questions, mainly from past A-Level examination papers, intended for consolidation and revision. Answers are included.