Electric fields exist when a charge is present, therefore we're exposed just by sitting next to a lamp that's plugged into an outlet.

当电力供应存在时，电磁场便会产生。所以，当我们坐在一盏打来了的台灯旁边时，我们便暴露在电磁场中了。

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It can easily power a 12vdc 5 watts lamp or charge mobile phone or batteries during boiling water.

它可以很容易地12 V直流电源一个5瓦的灯泡或充电电池的移动电话或水在沸腾。

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My company for this high-performance batteries with a dedicated lamp holder, and is equipped with step-up and charge management system.

我公司针对此高性能电池配有专用灯头，并且配有升压及充电管理系统。

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For renewable energy on a smaller scale, a graduate student in Israel developed a prototype for an elegant rocking chair called Otarky that produces energy from its rocking motion and can be used to charge devices and power a lamp.

ENGADGET: Inhabitat's Week in Green: GPS shoes, shape-shifting bicycle and a wheelchair helicopter