A new wireless charging device can charge electric cars and medical implants at close range
    Scientists at Stanford University in the US have developed a device that can wirelessly charge a moving object at close range. The technology could one day be used to charge electric cars on the highway, or medical implants and cellphones as you walk nearby.


    According to the study, published in the journal Nature, wireless charging would address a major drawback of plug-in electric cars — their limited driving range.“Just as major power plants generate alternating currents by rotating coils of wire between magnets, electricity moving through wires creates an oscillating magnetic field which causes electrons in a nearby coil of wires to oscillate, thereby transferring power wirelessly,” the study said.The team transmitted electricity wirelessly to a moving LED lightbulb but the demonstration only involved a one milliwatt charge, far less than what electric cars require.“We still need to significantly increase the amount of electricity being transferred to charge electric cars, but we may not need to push the distance too much more,” Fan added.

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