The Electrical Science Fundamentals Handbook was developed to assist nuclear facilityoperating contractors provide operators, maintenance personnel, and the technical staff with thenecessary fundamentals training to ensure a basic understanding of electrical theory, terminology,and application. The handbook includes information on alternating current (AC) and direct current(DC) theory, circuits, motors, and generators; AC power and reactive components; batteries; ACand DC voltage regulators; transformers; and electrical test instruments and measuring devices.This information will provide personnel with a foundation for understanding the basic operation ofvarious types of DOE nuclear facility electrical equipment..