The theme of this course is the analysis of electric circuits. Especially D.C-circuits and A.C-circuits. The theory of magnetism and its application will be also discussed. The various components and interconnection of an electrical system comprise what is described as an electric circuit, and a circuit diagram is a graphic representation of an electric circuit. It provides the basic concept of electric circuits.The main topics of this course includes:Resistor and Ohm’s Law；Serial and Parallel circuit and Kirchhoff’s law；Super position theory；DC power testing and maximum power output testing；RC ；RL.