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Thermocouples are a piece of technology which is used to measure temperature.

when the hot junction of the thermocouple is subject to heat a small electrical

voltage is generated within the thermocouple wires and this is known as the

e.m.f.

It is not so much an electric current that is created within the wires

but a small voltage which is created and the e.m.f. voltage can be measured

and used to indicate the signal which represents the temperature.

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