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Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
I was watching TV and I saw a part of a commercial where a guy was dancing and then he pulled out a cell phone and checked the "downloading bar" or something like that. That got me thinking... what if we were able to partially charge our cell phone batteries by doing everyday things like walking? Most smart phones won't last more than a day on a single charge but even if moving only produced a little charge, maybe it could be used to charge a backup battery for emergency calls or something. How feasible is this? obviously space would be an issue, however if it worked well enough maybe the technology could be expanded to bigger things that ran off batteries.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Science 9 September 2005: Vol. 309 no. 5741 pp. 1725-1728 Generating Electricity While Walking with Loads
Lawrence C. Rome1,2,*, Louis Flynn1, Evan M. Goldman1 and Taeseung D. Yoo1
+ Author Affiliations
1 Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA. 2 Marine Biological Laboratory, Woods Hole, MA 02543, USA. Abstract
We have developed the suspended-load backpack, which converts mechanical energy from the vertical movement of carried loads (weighing 20 to 38 kilograms) to electricity during normal walking [generating up to 7.4 watts, or a 300-fold increase over previous shoe devices (20 milliwatts)]. Unexpectedly, little extra metabolic energy (as compared to that expended carrying a rigid backpack) is required during electricity generation. This is probably due to a compensatory change in gait or loading regime, which reduces the metabolic power required for walking. This electricity generation can help give field scientists, explorers, and disaster-relief workers freedom from the heavy weight of replacement batteries and thereby extend their ability to operate in remote areas.
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Recharge a cell phone by moving
