This formula and table book, featuring numerous illustrations, focuses on the most important data and relationships, making it a compact, carefully structured reference work for both trainees and qualified professionals. It includes the operating manual for the "Casio fx991DE" calculator. Contents include: physical and mathematical fundamentals, formulas of mechanics, formulas of electrical engineering, formulas of electronics, and an index of terms. The currently particularly relevant topic of "Electric Energy Generation" has been updated, covering both inductive voltage generation (steam, water, wind) and non-inductive voltage generation (photovoltaics, fuel cells).