Explain the working principle of thermocouples.

A thermocouple is a device used to measure temperature based on the thermoelectric effect. The working principle relies on the fact that when two dissimilar metals are joined together at one end, and the other ends are kept at different temperatures, a voltage (electromotive force, or EMF) is generated. This voltage ____ ___ _________ _____ ____ ______ _______ ________ __________.
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