Thermo electric energy

Thermoelectric energy is nothing but electrical energy generated from heat. Thermionic conduction in electronic devices is an example. Here the so called thermionic valve is acting as power generator. The output power is too low so this is not an advisable energy tool. When two dissimilar metals are joined and form two junctions with one junction heated, potential difference is developed between the two junctions which is termed as Seebeck effect. Nowadays thermo electric generators with powers 50 KW present. This is very much of use in space applications