thermoelectricity
noun
ther·mo·elec·tric·i·ty ˌthər-mō-i-ˌlek-ˈtri-sə-tē 
-ˈtri-stē
: electricity produced by the direct action of heat (as by the unequal heating of a circuit composed of two dissimilar metals)
Example Sentences
Recent Examples on the Web Another idea is creating electricity through thermoelectricity, converting variations in temperature into electric voltage. 
Alex Davies, WIRED, 12 Mar. 2015 Thermoelectricity—or electricity produced through temperature differences—originated in 1821 when Thomas Seebeck and Jean Peltier discovered the conversion of heat to electricity. Kristen A. Schmitt, Smithsonian, 10 Apr. 2017
Alex Davies, WIRED, 12 Mar. 2015 Thermoelectricity—or electricity produced through temperature differences—originated in 1821 when Thomas Seebeck and Jean Peltier discovered the conversion of heat to electricity. Kristen A. Schmitt, Smithsonian, 10 Apr. 2017 Word History
First Known Use
1823, in the meaning defined above