I was reading about WiTricity (http://en.wikipedia.org/wiki/WiTricity) a technology developed by MIT to wirelessly transmit electricity through resonance, and I have this question:
Given the phenomenon of resonant inductive coupling which wikipedia defines as:
the near field wireless transmission of electrical energy between two
coils that are tuned to resonate at the same frequency. http://en.wikipedia.org/wiki/Resonant_inductive_coupling
And the Schumann resonances of the earth ( ~7.83Hz, see wikipedia), would it be theoretically possible to create a coil that resonates at the same frequency or one of it's harmonics (7.83, 14.3, 20.8, 27.3 and 33.8 Hz) to generate electricity?
I have a feeling that these wavelengths may be too big to capture via resonance (they are as large as the circumference of the earth if I understand it correctly), so alternatively would it be possible to create a coil that resonates with one of the EM waves that the sun sends our way?
Best Answer
In principle of course you try something like that. But there are three issues that will kill you: