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This may be another troubling invention in history. Scientists invented a device that allows the phone to use voice for charging during a call. The technology converts sound into electricity, and the phone charges when the user calls, and the louder the sound, the faster the charging.
This is a great news for people who love phone porridge, but science and technology are always a double-edged sword. Maybe in the public there will be people who make loud noises to charge the phone in the future. In addition to charging the phone, the technology can also be used on other devices, such as music players, and you may be able to use your voice to charge your iPod.
Sang-Woo Kim, a researcher at Sungkyunkwan University in South Korea, said that just as a speaker converts an electrical signal into a sound, the sound signal can also become a power source. This process is reversible. He added: "A lot of people are exploring how to get energy from the living environment. Our daily life and the surrounding environment are full of a lot of sound, but no one sees it as an energy source. In fact, speech, music, or It's the noise that can be converted to electrical energy."
This device uses piezoelectric effect to generate electricity. The whole device is like a sandwich. Nitride and gold-palladium compounds sandwich zinc oxide nano-pipes. When the outside sound is transmitted to the surface, the vibration of the sound waves will cause the zinc oxide nano-tubes to compress and stretch, thereby generating a slight amount of voltage.
Currently, this device can convert a volume of about 100 decibels into 50 millivolts, which is equivalent to the volume of a passing train or lawn mower. However, mobile phones usually require 2-3 volts to work, and the daily speaking volume is around 70 decibels. Therefore, this kind of apparatus cannot be applied to the mobile phone at present yet, the scientists are carrying on the thorough research to the raw material, hope to be able to utilize the smaller volume to produce greater voltage.
At the same time, American scientists are also developing a device that can use the movement of the knee while walking to generate electricity, which can help working people recharge their mobile phones and other devices on the way to and from work.
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