The Secret Life of Circuits

A richly illustrated deep dive into how electricity and circuits really work — from the physics of charge and fields to the messy truth of real-world component behavior — by acclaimed security researcher and electronics obsessive Michal Zalewski.

Real circuits don’t behave the way you might have been taught. The Secret Life of Circuits is a physics-first deep dive into circuit design — covering not just the theory behind fields, charge, and signals, but the parasitics,coupling, ringing, noise, and failure modes that cookbook electronics education systematically ignores.

Michal Zalewski, a self-taught polymath who spent 11 years leading Google’s product security program, brings hundreds of original diagrams, photographed experiments, and step-by-step mathematical models to bear on the real behavior of electronic components. The result is a book that builds working mental models rather than a collection of memorized rules — rigorous enough for working engineers closing gaps in their foundational knowledge, readable enough for makers and self-taught hobbyists who are tired of following tutorials they don’t fully understand.

Inside the book, readers will find:

• Physical foundations of electricity developed from first principles, not hydraulic metaphors
• Detailed treatment of real-world component behavior: parasitics, tolerances, temperature dependence, and failure modes
• Hundreds of original diagrams, schematics, and photographs of actual lab experiments
• Mathematical models derived step by step, with intuitive explanations alongside the equations
• In-depth coverage of signals, noise, coupling, resonance, and other effects, demonstrated through photographed experiments
• Guidance on reasoning about unfamiliar circuits from fundamental principles rather than pattern-matching to known designs