Basic Electrical Calculations
If you want a concise, in-depth explanation of the fundamental theory of electricity and its uses. It is without a doubt the best book of its kind for both general and more focused electrical fundamentals studies.

Basic Electrical Calculations aims to provide entry-level engineers with a strong introduction to power technology in non-technical terms as well as non-electrical professionals with a fundamental understanding of electrical concepts, design considerations, construction practices, and basic electrical concepts commonly used in the industry. Thus, the reader is given a thorough introduction to all significant facets of electricity.

Additionally, Basic Electricity helps the lay reader who just wants to understand the fundamental ideas behind electricity or who wants to research more complex ideas and applications.