Japanese Researchers Harvest Waste Energy from Microwave Ovens to Power Small Kitchen Gadgets
To harness that energy, they then designed a power harvester the size of a US quarter, or UK 10 pence piece, that combined with a 1-cm-long microwave antenna to generate an electric current that could charge a circuit. “The energy accumulated over a two-minute run of the microwave oven was enough to operate some low-power kitchen tools for a few minutes,” says Kawahara. So by leaving gadgets close to the microwave, they would be gradually charged up enough to operate. He says the harvester is small enough to be embedded in most kitchen gadgets.
Michael Rodrigues, a researcher in energy harvesting technology at University College London, says the microwave scavenging technique has promise in a growing area: it could fuel development of energy-neutral sensor networks that make homes smarter without boosting their carbon footprint, he says.
(via Leaky microwaves can power your kitchen gadgets - tech - 20 September 2013 - New Scientist)