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DIY Thermoelectric Generator
Thermoelectric systems produce electrical energy out of a heat-source.
References
Basic Info
From Wikipedia:
Used to be made of bimetallic junctions.
Are now made of highly doped semiconductors, from bismuth telluride, or lead telluride, or calcium manganese oxide.
Electromechanical systems including turbines, such as Stirling engines, are more efficient.