If you think that electricity is some kind of juice that burns in your lamp like a candle, or if you worry about violating Ohm's law, then this book is for you. On the other hand, if you know that a complete circuit is required for current to flow, but wonder whether higher voltage or higher current will kill you first, then this book is also for you. Even if you understand how electricity animates your vacuum cleaner, but are a little hazy about when to use rechargeable versus alkaline batteries, or how a computer executes instructions, then this book is for you as well. In fact, unless you are heading off to an isolated tropical island to shed modern civilization and live off of fish and coconuts, this book is for you.