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Electricity over the air

dixonselvan

Is it really possible to transmit electricity over the air? To charge Bluetooth headphones or a Wi-Fi hotspot, maybe why not charge our mobile phones when connected to Wi-Fi?

 

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Electricity over the air

German student creates electromagnetic harvester that gathers free electricity from thin air

Parents

  • RF transmission is incredibly lossy.  You run into the 1/r^2 issue with all EM signals.  So you lose 75% at the first increment about 89% at the second incremental distance.

     

    So you have to keep all of the devices very close to ensure a tuned circuit transfer.  Even then, the efficiency is very low.

     

    DAB

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  • RF transmission is incredibly lossy.  You run into the 1/r^2 issue with all EM signals.  So you lose 75% at the first increment about 89% at the second incremental distance.

     

    So you have to keep all of the devices very close to ensure a tuned circuit transfer.  Even then, the efficiency is very low.

     

    DAB

Children