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One horsepower =735 W Watt a powerful idea! (or 746 W in non-metric horses) SCHOOL Cycling Using energy Walking We all use energy, but how efficiently do we use it? It might be easier to go to school in a car, but it uses more energy than if you walk or cycle. 5 million W 11 billion W 70 quintillion W Person running Lawnmower Racing car Train engine Shuttle takeoff 2004 Indonesian earthquake (c) 2011 Dorling Kindersley, Inc. All Rights Reserved. Electricity Electrons Zap! A bolt of lightning is the biggest and most spectacular release of electric charge you’ll ever see.

Wrong. You get instant power not because electrons race along wires but because they bump into each other, passing the charge all the way from the power plant to your home. The electrons themselves drift along wires about ten times slower than a snail. A circuit is a closed loop through which electricity can flow. (c) 2011 Dorling Kindersley, Inc. All Rights Reserved. I may be slow, but I’ll get there faster than an electron. 67 Modern measuring Light fantastic Light is a form of energy that travels in waves.

The smallest lightning bolts are as thin as pencil leads; the largest are as thick as a man’s arm. Lightning heats the air to 50,400ºF (28,000ºC), making it expand so violently that it explodes, causing the bang that we hear as thunder. How much power does it take to run these household products? 8 watts 60 watts 75 watts 150 watts 300 watts 500 watts 800 watts 1,500 watts 2,000 watts The amount of energy an electrical device uses each second is its power, measured in watts. To find the total energy it uses, multiply its power rating by how long you use it.

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