I found the excerpt an interesting read and there is definitely a lot one can learn about electricity. The analogies and humorous tone such as questioning why the farmers in Greece would want to rub their sheep with pieces of amber in the first place makes it much more interesting.
The book is targeted towards the younger audience as it creates an atmosphere that would allow children to enjoy the book and this is what the author wants. However, it seems to be targeting the more younger children rather than the preteen/teen age children which I think is not enough to really create an impact in educating the youth about electricity and giving them a better understanding of it.