Massachusetts Institute of Technology’s researchers in the US have discovered that a wireless power transmission system turns more competent as more devices are being powered.

The latest work assembles on their unique finding, declared in 2007, of using electromagnetic resonance between coils to transmit power wireless.

The electromagnetic field between the coils isn't interrupted by objects or people, which are secured from being zapped by the energy transfer.

As summed up in an MIT story, three of the researchers, Andre Kurs, Robert Moffatt and MIT Professor Marin Soljacic, placed a little bigger sending coil and two receiving coils that were half the size of the original: 12 inches.

It was found that powering one device with one receiving coil leads in fewer than 20% efficiency in power transfer. But with two devices and two receiving coils, the competence mounted to 30%.

According to the researchers, the receiving coils continue to shrink to an extent that ultimately would make them practical for even mobile devices.

The MIT story reveals that some big firms, including Intel and Sony, have applied the study to initiate their own wireless power plans.

Most of the current work is focused on engineering, lessening the size and breadth of the receiving coils, and creating computerized tuning and electrical controls systems.