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Thermopile
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<p>A thermopile is an electronic device that converts <a href="/facts/Thermal_energy/eVaKAC7K">thermal energy</a> into <a href="/facts/Electrical_energy/V0pJUrDY">electrical energy</a>. It is composed of several <a href="/facts/Thermocouple/FW9cYU5D">thermocouples</a> connected usually in <a href="/facts/Series_connection/007qC7j8">series</a> or, less commonly, in <a href="/facts/Parallel_connection/007qC7j8">parallel</a>. Such a device works on the principle of the <a href="/facts/Thermoelectric_effect/GbRYmwIG">thermoelectric effect</a>, i.e., generating a voltage when its dissimilar metals (thermocouples) are exposed to a temperature difference. </p>