Describe the method by which an electrical potential developed in generators and thermocouple?

Thermoelectric generator is the method by which an electrical potential developed in generators and thermocouple.

Explanation:

A thermoelectric generator (TEG),  is otherwise known as a Seebeck generator, it is a solid-state device that directly converts heat flux into electrical power by a phenomenon called a Seebeck effect.Thermoelectric generators operate like heat engines except they are less voluminous and have no movable parts. TEGs are therefore usually more costly and competitive and it's efficient is less.Thermoelectric generators may be used in power plants to transform excess heat into extra electrical power, and in machines to improve fuel efficiency.