Wireless technology can now deliver
electric power to moving vehicles. In next-generation electric cars, pick-up coil
sets under the vehicle floor receive power remotely via an electromagnetic
field broadcast from cables installed under the road. The current also charges
an onboard battery used to power the vehicle when it is out of range. As
electricity is supplied externally, these vehicles need only a fifth of the
battery capacity of a standard electric car, and can achieve transmission
efficiencies of over 80%. Online electric vehicles are currently undergoing
road tests in Seoul, South Korea.
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