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The Electric Circuits 9th Edition PDF represents a planned revision designed to incrementally improve this introductory circuits text used by more than 700,000 students worldwide during the past 28 years. While the book has evolved over the years to meet the changing learning styles of students, the fundamental goals of the text remain unchanged. To build an understanding of concepts and ideas explicitly in terms of previous learning. Students are constantly challenged by the need to layer new concepts on top of previous concepts they may still be struggling to master.