In 1821, Thomas Johann Seebeck discovered that a thermal gradient formed between two dissimilar conductors produces a voltage. Today, electricity is created from a thermo-electric generator in the temperature differential between the heat from your Kimberly™ wood stove and the cooler, ambient air.
In more technical terms, the temperature gradient in a conducting material results in heat flow; this results in the diffusion of charge carriers. The flow of charge carriers between the hot and cold regions in turn creates a voltage difference.
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