Torch works without battery or electricity – Just with your body heat - ******************************************************************************************* ‘Flashlight Powered By Body Heat’, developed by a 15 year old school student Ann Makosinski. he flashlight works on the thermoelectric effect – that is direct conversion of temperature difference into electricity. A thermoelectric device creates voltage difference between the two sides of it at different temperatures. Ann put up aluminium tiles on the surface of a hollow pipe and the air flowing through it allows to maintain the temperature difference by keeping the other side cool. When the user holds the flashlight, the body heat causes the metallic strip to have higher temperature than the one with aluminium strips. This temperature difference is turned into electricity to power the LED flashlight by the thermoelectric device. Ann could make the device under just $25 (Rs 1250) and believes that if the device is mass-produced, the cost would come down significantly to an extent of Rs 500. Using the same technology mobile phones also can be charged by holding in our hand and the day is not too far for that research. Check out Ann Makosinski explaining her project and how she put simple science technique to some creative use by this demonstration vedio above - See more at: aanthaireporter/?p=35863#sthash.ZvG7bIm0.dpuf
Posted on: Wed, 03 Jul 2013 12:59:01 +0000
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