Soon, tiny flying helicopters will charge your phone
Quadrotors are rapidly becoming popular devices. They’re basically small robots with four helicopter blades that allow it to move and hover. And, if you’re a creepy Dutch artist, turn your dead cat into one.
It works like this. Both the quadrotor, which is just floating idly nearby somewhere, and your phone have a copper circle embedded into them. This creates a magnetic field when you run some electricity through it. Normally, these fields are weak.
But, when they get close enough to each other, they resonate; that is, they’re close enough in frequency that your cell phone will absorb the energy from that frequency. If you’ve ever seen an opera singer shatter a wine glass, or this famous video of the Tacoma Narrows Bridge:
You understand the basic idea. It absorbs more and more of the energy.
This is still being worked on in the University of Nebraska lab, but it’s a pretty compelling idea that will help bring electricity to even the most obscure of places.