Linked by David Adams on Tue 20th Jul 2010 18:09 UTC
Hardware, Embedded Systems Japanese printer company Brother has invented a battery that can be recharged by shaking it. It's intended for devices like remote controls that use very little power and would normally require infrequent battery charges, so unfortunately you couldn't use it to power a car that could drive forever on a bumpy road.
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more energy
by vasper on Wed 21st Jul 2010 07:32 UTC
vasper
Member since:
2005-07-22

Energy is always lost when something is using it, usually converted to heat. A perfect system would be a perpetual motion machine, but that is impossible.

However, you can create systems that recycle as much of the energy as possible. For example, when we are walking, all of the energy we expend is lost. A system in our shoes that converts pressure to electricity (piezoelectricity it is called) can recharge our iPods or mobile phones.

Also the same technique can be used in roads specially constructed to create electricity when a moving car passes over them. Such a project is already being used experimentally.

Reply Score: 3

RE: more energy
by lubod on Wed 21st Jul 2010 09:54 in reply to "more energy"
lubod Member since:
2009-02-02

+1 to vasper.

Period.

Q.E.D.

Edited 2010-07-21 09:56 UTC

Reply Parent Score: 1

RE: more energy
by mintar on Wed 21st Jul 2010 16:11 in reply to "more energy"
mintar Member since:
2008-09-26

However, you can create systems that recycle as much of the energy as possible. For example, when we are walking, all of the energy we expend is lost.


Not really. A huge part of the energy is recycled through elasticity in our tendons and joints. That's why a human can walk using only 50 W of power, while most human-sized walking robots need something in the order of 700 W.

Reply Parent Score: 1

RE[2]: more energy
by vasper on Fri 23rd Jul 2010 11:29 in reply to "RE: more energy"
vasper Member since:
2005-07-22

Not really. A huge part of the energy is recycled through elasticity in our tendons and joints. That's why a human can walk using only 50 W of power, while most human-sized walking robots need something in the order of 700 W.


The human body is efficient in it's workings. That isn't the same as recycling energy. Anyhow, the energy expelled from the body in the form of kinetic energy can be harvested by piezoelctric mechanisms to create electricity.

Reply Parent Score: 2