Phone battery flat? Gadget uses your voice to charge mobile

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Phone battery flat? Gadget uses your voice to charge mobile
By battery
Dated: May 09, 2011
It could go down as one of the most irritating inventions in history. Scientists have devised a gadget that
will allow mobile phones to be recharged simply by talking into them.
Phone battery flat? Gadget uses your voice to charge mobile | Battery Technology
It could go down as one of the most irritating inventions in history.
Scientists have devised a gadget that will allow mobile phones to be recharged simply by talking into them.
The technology turns sound into electricity, allowing a mobile to be powered up while a conversation is in
progress – and the greater the volume the greater the charge.
The invention is billed as a godsend for those who regularly suffer the frustration of flat batteries.
But there are fears it will simply be an excuse for inconsiderate phone-users to make even more annoyingly
noisy calls in public places.
The technology could also be used to power up personal music players, raising the possibility of charging
an iPod by singing along to your favourite songs.
Dr Sang-Woo Kim, of Sungkyunkwan University in Seoul, South Korea, said that just as speakers
transform electric signals into sound, the opposite process of turning sound into a source of electrical power
is possible.

He added: ‘A number of approaches for scavenging energy from environments have been intensively
explored. The sound that always exists in our everyday life and environments has been overlooked as a
source. This motivated us to realise power generation by turning sound energy from speech, music or noise
into electrical power.’
Dr Kim’s device uses tiny strands of zinc oxide – the main ingredient of calamine lotion – sandwiched
between two electrodes.
A sound-absorbing pad on top vibrates when sound waves hit it, causing the tiny zinc oxide wires to
compress and release.
This generates electrical current that can then be used to charge a battery.
Devices made so far can convert sounds of around 100 decibels – the equivalent of noisy traffic, a passing
train or a nearby lawnmower – into a mild electrical current.
Read More: http://
www.batteryfast.co.uk/battery-technology/phone-battery-flat-gadget-uses-your-voice-to-charge-mobile-batt
ery-technology/

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Category
Mobile, Technology, Electronics
Tags
phone, battery flat, Gadget uses, voice, charge mobile
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