A new research in nanotechnology will enable you to charge your mobile phone with your voice. This new technology coined by Electrical engineers from South Korea. They claim that this will also be able to harness background noise and even music to charge a phone. Sound into Electricity
Dr. Sang-Woo Kim, from Institute of Nanotechnology at Sungkyunkwan University in Seoul, South Korea, says, "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. Sound power can be used for various novel applications including cellular phones that can be charged during conversations and sound-insulating walls near highways that generate electricity from the sound of passing vehicles.". "The latter development would have the additional benefit of reducing noise levels near highways by absorbing the sound energy of vehicles."
Practically, we generate lot of sound in a day. Reportedly, on an average day a women speak about 20000 words. So, a good amount of energy is wasted and at the same time they were capable of generating more power using this technology. In the recent past, Nokia also developed a bike charger set which generates the power while riding a bi-cycle and we've also shared with you.
Coming back to this, the science works like this a pad within the phone vibrates when sound waves hit it, making zinc oxide wires set between electrodes compress and release. This is what is transformed into the electrical current- albeit a tiny one. A 100 decibels of sound can generate 50 milivolts. Dr. Kim said, "Our current output performance can be applied to various electronic devices with low-power consumption such as self-powered sensors and body-implantable tiny devices. We believe that we can realise more efficient sound-driven nanogenerators."