A complete electrical network in the form of a closed loop which gives a return path for electric current is known as an electrical circuit. There are various classifications of circuits such as on the basis of arrangement, type of current flowing through it, and the components. On the basis of arrangement, circuits are broadly divided to parallel circuits and series circuits. Circuits are classified as AC circuits and DC circuits, on the basis of the type of current which is flowing through it. System refers to the set of interacting entities which function together as a single unit. Study in the field of circuits and systems focuses on the analysis, theory and design of interconnected devices and components. The topics included in this book on circuits and systems are of utmost significance and bound to provide incredible insights to readers. It explores all the important aspects of these fields in the present day scenario. Scientists and students actively engaged in this field will find this book full of crucial and unexplored concepts.