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In a thermocouple, current flows from the metal occurring earlier in the thermoelectric series to the metal occurring later in the series through cold junction. Then why in a copper-iron thermocouple, current flows from copper to iron through hot junction?

In a thermocouple, current flows from the metal occurring earlier in the thermoelectric series to the metal occurring later in the series through cold junction. Then why in a copper-iron thermocouple, current flows from copper to iron through hot junction?

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