Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not a useful introduction

This text book was not easy to read or understand. It is NOT a textbook for an introduction to circuit theory. The example problems were simple but the exercises and problems did not ease a student into the understanding of electric circuits. The book tried to give a failed introduction into filters and signals.It can not be used as a reference book, you can never find what you are looking for.