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Out at sea, gentle waves provide power for thousands of homes.Researchers at the Georgia Institute of Technology said they had built a simple prototype device that could convert stop-start movement into power.Waves, walking and dancing – even rainfall, typing or urban traffic – could one day be harnessed to drive sensors, mobile gadgets or whole electricity plants, they contend. Its electricity is created from friction between two substances causing a charge of electrons to be transferred from one to the other.This gave it an energy efficiency of 24 percent, three times greater than piezoelectric, previously the best source of mechanical electricity harvesting – and as efficient as magnetic-induction turbines.The team is working on ways to scale up tribo-electric energy for harvesting power from the ocean.
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