Mind & Matter


Wireless Energy

Submit A Comment | View Comments

Disconnecting the electrical umbilical cord. Image by Jay Myrdal/Getty.


In a world powered by mobile technologies, power transmission remains a significant hurdle. From unsightly power lines to the mess of cables behind my desk, power transmission is inherently aesthetically as well as functionally challenged—not to mention consumes a massive amount of material resources.

The idea of wireless power transmission has been around for some time, and inventor Nikola Tesla advocated the transmission of power wirelessly at great distances. However, technological difficulties and safety concerns have thwarted the development of this technology—until recently.

Pittsburgh-based Powercast has developed a method of transmitting power via radio waves, and has demonstrated the capability to recharge small devices like remote controls and alarm clocks. The company Powerbeam advocates the use of infrared lasers focused on photoelectric cells, a technology that lacks efficiency but might eventually power wireless speakers and laptops.

Another technique is called magnetic induction—a process in which a fluctuating magnetic field generates electric current in a nearby coil—but which only works up to a few millimeters of distance. MIT’s Aristeidis Karalis is currently expanding the reach of this technology to two or more meters—enough distance to power many home appliances and mobile devices conveniently.

Safety concerns remain, of course, but early tests suggest that magnetic induction would not surpass the minimal thresholds set by the International Commission on Non-Ionizing Radiation Protection. At the rate of current progress, we may soon find our mobile technologies completely untethered from the outlet.


Comments (3 Total)

  • Posted by: Anonymous | Time: 10:58 AM Wednesday, February 10, 2010

    Another question we need to ask is why we are still distributing 115 and 230 VAC power throughout our offices and homes when most of the devices we use and charge use 5-12 VDC. The black current drain of all those separate transformers is becoming significant.

    Report this as offensive

  • Posted by: achlab | Time: 5:05 PM Tuesday, February 09, 2010

    Maybe you should cite Nicola Tesla before calling this a new technology.

    Report this as offensive

  • Posted by: Anonymous | Time: 2:41 PM Tuesday, February 09, 2010

    Charging my Palm Pre wirelessly with the touchstone right now as I type.

    Report this as offensive

Comment on this Post

Post your comment below. If you wish, enter a username and password though they are not required. Please read our Content Guidelines before posting.


Enter the code shown in the image

Username is optional


Enter a password if you want a username


About the Blogger

Blaine Brownell

thumbnail image Minnesota-based architect and author Blaine Brownell, AIA, is a self-defined materials researcher and sustainable building adviser. His "Product of the Week" emails and three volumes of Transmaterial (2006, 2008, 2010) provide designers with a steady flow of inspiration—a 21st-century Grammar of Ornament. Blaine has practiced architecture in Japan and the U.S. and has been published in more than 40 design, business, and science publications. The recipient of a Fulbright fellowship for 2006–07, he researched contemporary Japanese material innovations at the Tokyo University of Science. He currently teaches architecture and co-directs the M.S. in Sustainable Design program at the University of Minnesota. His book Matter in the Floating World was published by Princeton Architectural Press in 2011.