The laboratory investigations in this manual are designed to demonstrate the theoretical principles set out in the book Fundamentals of Electric Circuits, 7th edition. A total of 27 laboratory investigations are offered, demonstrating the circuits and theories discussed in the textbook. Each investigation can normally be completed within a two-hour period. The procedures contain some references to the textbook; however, all necessary circuit and connection diagrams are provided in the manual so that investigations can also be preformed without the textbook.