Eyewitness: Electricity presents the story of electricity — from the earliest discoveries to the technologies of today — explaining how our eyes receive light rays and turn them into electrical signals, how the chemicals in batteries work, how the invention of electric motors allowed for the creation of household appliances, what happens when you tune in the radio, and more. The most trusted nonfiction series on the market, Eyewitness Books provide an in-depth, comprehensive look at their subjects with a unique integration of words and pictures.