The chip could also use thermoelectric materials, which produce an electric current when exposed to two different temperatures-such as body heat and the (usually) cooler air around us.
Purdue University researchers are working with General Motors to build thermoelectric generators, which produce an electric current when there is a temperature difference.
珀杜大学的研究者们正在与通用汽车一道开发一种利用温差产生电流的热能发电机。
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But current commercial thermoelectric devices only achieve about one-tenth of that limit, Hagelstein says.