Switch On, Switch Off 自然科学启蒙2：打开，关上ISBN9780064450973

　　The switch goes up -- the light goes on, The switch goes down-- the light goes off.It seems like magic It's not -- it'selectricity. But how does a light actually work? In this clear andsimple book learn all about electricity, how it's produced, and howit can be used. At the end you'll learn how to conduct funexperiments that will let you generate electricity yourself

　　Children's Literature For all those kids who ask parents howthe light switch works and what electricity is, this is a greatbook. It explains how electrical energy is produced and offers asimple experiment that kids should be able to conduct. Berger nextdescribes how this energy flows to each house and the source ofthis electrical energy. Diagrams depict the circuitry outside andinside a home and illustrate the function of switches andelectrical outlets. A close up diagram shows a light bulb and howit works. There is even an experiment on the closing page that willlet kids produce an electrical current. An excellent choice forhome and school and a level 2 book in the "Let's-Read-and-Find-OutScience" series. 2001 (orig. 1989), HarperTrophy, $15.89 and $4.95.Ages 5 to 9. Reviewer:Marilyn Courtot School Library Journal K-Gr3-- An easy-to-understand, informative, and accurate scienceconcept book. Berger uses clear, succinct language to explain howelectricity is produced and transmitted, and how generators, lightbulbs, and electrical plugs work. Directions are given for readersto produce an electric current using wire, a bar magnet, and acompass. Croll's clearly labeled drawings are excellent, showingthe essential elements needed for understanding without unnecessaryclutter. This is an excellent book for school and public libraries.Another good source of easy-to-read information about electricityis Challand's Experiments with Electricity (Childrens, 1986).--Eunice Weech, M. L. King Elementary School, Urbana, Ill.