Electricity sets the world in motion. In this early introduction to physical science, children will explore the sources of electricity and learn how it's used to create light, heat, and mechanical power. With accessible scientific language, full-color photography, and clear illustrations, this book explains basic electrical concepts such as circuits, switches, conductors, and more. Children will learn about electricity in their own homes and basic safety precautions, too. A series of simple questions with an answer key in the back of the book will encourage children to discover the young scientists in themselves.