01 Aug A cell phone without battery
The world needs more and more energy, so how could we reduce our consumption?
Well, we already think about turn off light when you leave a room but now we could imagine using our cell phone without battery!
In fact, a crew in University of Washington developed a prototype and it works.
They eliminated a power-hungry step in modern cellular transmissions — converting analog signals that convey sound into digital data that a phone can understand.
Instead, the battery-free cellphone takes advantage of tiny vibrations in a phone’s microphone or speaker that occur when a person is talking into a phone or listening to a call.
Have a look on the video:
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