A brief biography of Serbian-American scientist Nikola Tesla, whose early fascination with electricity caused him to go on to invent alternating current and many devices that helped bring electricity to American households and, eventually, the rest of the world, at the turn of the twentieth century. Interest Level: 3-6 Reading Level: 4.9 ATOS Book Level: 5.3 AR Interest Level: LG AR Points: .5 AR Quiz: 162951EN Reading Counts Level: 5.5 Reading Counts Points: 3 Lexile Measure: 840 Fountas & Pinnell: S.