That doesn't surprise me in relation to 'close-coupled' inductive power transfer - after all, that's just like a conventional transformer, without a core and with a bit more distance between primary and secondary coils. Such technology has been used for decades, in all sorts of fields, and I can believe that, in some situations, it can be 'quite efficient'.Apparently the efficiency can be greater than 50%:
... but, as I've just written, I imagine that is inductive coupling, not 'wireless'.Works well for charging electric vehicles!
As I've just written, as with cars that's really inductive coupling (a technology that has been used for years), rather than 'wireless'.It is a new tech. Used mainly for mobile phone charging at the moment.
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