The waste of energy that recharges smartphones

The energy waste it's not just those related to human bad habits. There are several forms of unused energy, it is invisible energy that is dispersed without dictating any benefit. Let's talk about microwave and signals Wifi. Fortunately, a new type of device developed by Duke University has proven capable of capturing microwaves and converting them into usable electricity to power small electrical devices.

The researchers of the Pratt School of Engineering Duke have managed to develop this device capable of collecting the so-called "wireless energy ". The device was made with low-cost materials, it is composed of a series of conductors connected together to form a circuit capable of delivering an electrical capacity of 7.3V.

If this seems like a small amount, just think that common USB chargers have an energy output of only 5 V. What should be oneenergy waste, thanks to Duke University, it is transformed into a source of vital energy for gadgets such as notebooks, smartphones, tablets ...

According to Duke researchers, the device would have the same energy harvesting efficiency as modern solar panels. In other words, the device fails to fully recover it energy wasterepresented by microwaves and WiFi signals, only 37 percent of invisible energy is converted into direct current, a percentage comparable to that of the efficiency of modern solar cells.

Hotels, restaurants, lounge bars, businesses… all modern buildings include a large number of wireless repeaters, wifi routers and microwaves. Among the possible applications, the Duke University device could be integrated into the ceilings of the most modern structures in order to recover the energy lost by the WiFi signals, active 24 hours a day. The device can be calibrated on different frequencies and can recover different sources of energy, from vibrations to sound. In the future, with the help of metamaterials, smartphones could self-feed by exploiting the same Wi-Fi energy emitted to connect to the network.

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