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Thomas Johann Seebeck accidentally discovered the Thermocouple in 1821. He experimentally determined that a voltage exists between the two ends of a conductor when the conductor’s ends are at different temperatures. His work showed that this voltage is proportional to the temperature difference. His discovery soon became the basis of “the thermocouple”, which today is one of the most popular and cost effective temperature sensors

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Q: Who discovered the thermocouple?
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