At the Korea Advanced Institute of Science and Technology, researchers report that they have a developed a dipole coil resonant system that can transmit electricity across a range of five meters, and power, for instance, a large LED TV system and three 40 watt fans.
This is an advance on a 2007 experiment at the Massachusetts Institute of Technology, when electric current was transmitted wirelessly across a six-foot gap.
The technology remains – for the time being at least − costly and still in its early stages. But its begetters have high hopes.
"Just like we see Wi-Fi zones everywhere today, we will eventually have many Wi-power zones at such places as restaurants and streets that provide electric power wirelessly to electronic devices," predicts Chun T Rim, a nuclear and quantum engineer. "We will all use the devices anywhere without tangled wires attached, and anytime without worrying about charging their batteries."
Tim Radford is editor of Climate News Network, a journalism news service delivering news and commentary about climate change for free to media outlets worldwide.