This book is designed keeping in mind that the students of Electrical Sciences study it as a one-semester introductory course on the subject. The book provides a comprehensive study of the subject covering basic as well as advanced concepts. Informal and simple in discussion, the text is prepared without diluting the rigor of the concepts.The book is different from other books in the same area in terms of its simplicity, style of discussion and the nature of examples provided. Each chapter begins with an introduction outlining the contents and objectives. Conceptual understanding and problem-solving approaches are related exquisitely. Each concept is strengthened with examples and reinforcement problems that are different in nature. Abundant problems are provided to reflect the real-time engineering applications.