Televisions rank among the most-used appliances in American homes. In 2008, the U.S. Energy Informa- tion Administration esti- mated that we used 101 billion kilowatt hours of power—7.3% of our total residential electric- ity usage—watching the tube. Meanwhile, new technologies allow us to watch our favorite shows in big, bright, real-to-life pictures, and many households have a TV in nearly every room.
展开▼
