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The fibers can also be combined with conductive thread, which acts as a heating element when electric current runs through it.

The current is no longer able to flow without resistance through the nanowire and is instead shunted to a small resistive heating element connected to each pixel.

The metals were thought to come from the heating element - but the tests showed they were in the e-liquid itself.

Some ovens with heating elements at the top and bottom are designed to use both of them to quickly heat the cavity, and then the top element turns off once the desired temperature is reached.

Most multicookers have one heating element at the bottom of the base, while some slow cookers also include a band around the sides.