Nicola Tesla made so many experiments on how to transmit power wirelessly. Experiments were successful but not utilized. If we can use wireless frequencies to transmit data, then we defiantly can also use the same wireless frequencies to transmit power. Some companies such as uBeam use ultrasound waves which didn't seem to be working very well. They say energy could neither be created nor destroyed but it can be converted to other forms of energy and be reused over and over again. Cell phones could simply have a receiver such as a power-harvesting circuit that can be designed to absorb the wireless energy not just as a data receiver but as a power receiver to the phone.
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