Mark Twain 
A Connecticut Yankee in King Arthur’s Court [EPUB ebook] 
With linked Table of Contents

After a blow to the head, an American named Hank Morgan wakes up in England. Specifically, King Arthur’s England of 528. With no other options, Morgan uses his knowledge of science to pass himself off as a great wizard. This earns him the enmity of Merlin. Biting social commentary and laugh out loud humor make this book a classic.