In this established textbook, now in its 18th edition, the fields of direct current technology, electric and magnetic fields, as well as alternating current technology are presented in a coherent and clear manner. The discussions begin with the treatment of direct current circuits. This is followed by an introduction to various methods of network calculation. The description of electric and magnetic fields follows. In the second part of the book, the different areas of alternating current technology are addressed. To achieve optimal understanding of the material, readers are gradually guided from simple concepts to more complex problems. Additionally, each section is accompanied by exercises with detailed solutions, which are particularly important for the comprehension of the topics.