If you are preparing for an electrical exam this book is a must! The electrical theory book covers the atom, valence shell, batteries, capacitors, series, parallel, series-parallel circuits, the power wheel, volt-amp, watt, current flow path, energy, friction, fission, inertia, magnetism, motors, generators, sine wave, impedance, transformers, inductance, etc. This book contains 10 practice exams and a final exam. Answers are explained easily in detail. Author: Tom Henry