当然，那还有很长的路，目前的无线供电技术仅限于几英尺并且要用很大的线圈来传送电力。

Of course, that’s a ways off, right now the technology only works over a few feet and that’s using very large coils (see the picture above) to send the electricity.

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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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本文介绍一种新的电焊机线圈温升检测技术的基本原理。

The concept and technology of welding machine coil temperature testing are introduced in this paper.

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