A transmitter coil, 26cm in diameter, can beam up to 15 watts of power to a receiver coil just 4.3cm across.

一个直径26厘米的发射线圈能够无线传输给接收线圈15瓦的功率，传输距离为4.3厘米。

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In basic terms, the system has power lines connected to coils under the surface of a road, which then transmit the electricity through the air to a receiver coil in a car.

简单地讲，这个系统将输电线和路面下的线圈相连接，通过空气将电能传输给汽车里面的接收线圈。

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The receiver pad coils are magnetically coupled to the primary power coil.

电力接收垫线圈与主电力线圈是磁耦合的。

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That is because the transmitter uses a large flat coil, placed over the heart, to generate the magnetic field that powers the receiver.

ECONOMIST: Case history