开关卡的技术指标通常给出继电器的驱动电流值，而不是线圈功率。

Switch card specifications typically specify relay drive current rather than coil power.

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了解线圈功率的含义及其特性是非常有益的，但是人们在选择开关卡并非必须要考虑该技术指标。

It is useful to understand the meaning and characteristics of coil power, but one generally does not have to consider this specification when selecting a switch card.

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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。

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

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