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Simply put, this book is very poorly-written. It's not just that it's confusing, but that its language simply doesn't make sense. Two examples from the first two pages: "Energy can be described in many ways, but basically, energy is referred to as the capacity of developing a specific work." What, exactly, does "developing a specific work" mean? And given that this is the first definition provided, and we haven't yet defined "work"... Then there's this on the next page: "The load is the element that receives electricity from performing some sort of work." "Receives from"? What does that mean? And he still hasn't defined "work". And as far as I can tell, he never does.