The present book is designed to meet the requirements of B.Sc., B.E. and A.M.I.E. students. It will also be useful for the students taking various competitive examinations. The book divided in 5 units and 15 chapters? deals with the basic concepts of circuit fundamentals and basic electronics. The first unit contains three chapters which cover the topics related to Circuit Fundamentals whereas the last 4 units contain 12 chapters which cover the topics related to Basic Electronics. The topics have been presented in systematic, logical and lucid manner and explained with the help of solved examples.