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Hungry bug seeks hot meal
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2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
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GSAT Exam Preparation Jamaica
How are students placed after passing the GSAT exam
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT Exam Preparation
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
GSAT Exam Preparation
Results of GSAT are in schools this week
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Math of the World
Math and our number sense: PassGSAT.com
Setting a Prime Number Record
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Teen Brains, Under Construction
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Kids now getting 'adult' disease
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Electric Backpack
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A Clean Getaway
Young Scientists Take Flight
Slip Sliming Away
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Problems with Prepositions
Transportation
Middle school science adventures
Troubles with Hubble
Morphing a Wing to Save Fuel
Weather
Polar Ice Feels the Heat
Catching Some Rays
Antarctica warms, which threatens penguins
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Electric Backpack

Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don't mind carrying a heavy load, your backpack might also power your MP3 player, keep your cell phone running, and maybe even light your way home. Scientists from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass., have invented a backpack that makes electricity from energy produced while its wearer walks. The backpack's electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer's back, and the whole pack moves up and down as the person walks. A mechanism with gears collects energy from this motion and transfers it to an electrical generator. Surprisingly, the researchers found, people walk differently when they wear the springy packs. As a result, wearers use less energy than when lugging regular backpacks. Also, the way the new packs ride on wearers' backs makes them more comfortable than standard packs, the inventors say. The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. These people often rely on global positioning system (GPS) receivers, night-vision goggles, and other battery-powered devices to get around and do their work. Because the pack can make its own electricity, users don't need to give up space in their packs to lots of extra batteries. For the rest of us, power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricity-generating packs aren't on the market yet, but if you do get one eventually, just make sure to look both ways before crossing the street!E. Sohn

Electric Backpack
Electric Backpack








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