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Students have plenty of experience using everyday household appliances that rely on electric circuits for their operation. They very likely have developed a sense that you need a battery or power switch to be turned on to make things ‘work’, and that batteries can go ‘flat’. They tend to think of electric circuits as involving something they call ‘current’ or ‘energy’ or ‘electricity’ or ‘voltage’, all labels which they often use interchangeably. The principles of circuit analysis are fundamental to the practice of electrical and electronic engineering. An electric power system is a network of electrical components deployed to supply, transfer, and use electric power. In this book, the reader will find a theoretical introduction to Circuits and Systems and their applications.