Before reading this book I knew 'vaguely what electric parts do', and I could probably plug together a circuit from a diagram. I also have grades in science courses that say I understand volts and currents and resistance and all that.
Now I have read this book, I feel I understand the basic ideas behind the most important electronic ideas and jargon, to at least to the level I need to to 'get' most household devices. Kenn's way of explaining might seem 'silly' or 'stupid' because it is so easy and pleasant to read, but under that easy reading is a torrent of well disguised knowledge and information. I have come away from this book with a much better grasp of electricity and how it works.
If you need a way to think about electricity and those 'electron things', to see things from another perspective, then get this book. If you're looking for an entertaining read and you've ever wondered how your radio works... well, get this book! You really need no prior knowledge and you'll come away feeling better about the whole idea of electricity.
A 'fact' about the book - it isn't a course textbook. This is not a negative point though, just a warning if you have limited funds and you have been told need a textbook. It isn't a bible of formulas, it doesn't contain any complex circuit diagrams, and it doesn't have more than a few simple math formulas. Despite this, I would hate to study electronics without reading this book first, so I recommend it in addition to a textbook if possible!