The story goes back in the years that Nicola Tesla was working with wireless energy transfer, because he could not believe that a global network of wire could exist. Well, today it does exist, nevertheless wireless energy transfer is still a gadget to come.
After years of research and experiments, scientists found the key of efficient wireless energy transfer. The problem so far was that induction works for extremely short distances. The key to this problem, is resonance. Watch the following video to learn how it actually works. This is a short 2 minutes video which explains the principle of operation:
The complete long version video (10 minutes) is this one, and it surely worth to watch:
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