Hello, dear readers. This is my book on the topic of electrolysis. In it I want to describe in an accessible language the entire process of creating an electrolyzer and calculating its power. I also want to talk about what exactly water electrolysis is. I don’t want to claim primacy in explaining this topic; before me it was described in textbooks, reference books, a lot of people wrote about it, for example, the American Stanley Meyer, who advanced this topic is very far from the Russian engineer Alexey Burkan, who devotes his life to the topic of hydrogen technologies, etc. I hope you enjoy this book. Attention! This book is educational in nature. This means that the author is not responsible for anything that might happen to you after reading this book. Konyaev A.S.