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Is thermocouple active or passive?

in Electrical Engineering

Is thermocouple active or passive?

1 Answer

A thermocouple is considered passive.

Here's why:

A thermocouple works based on the Seebeck effect, which generates a small voltage (called the thermoelectric voltage) when there is a temperature difference between its two junctions (the hot and cold junctions). This voltage is not generated by an external power source; it is simply a response to the temperature difference.

So, since the thermocouple doesn't require an external power source to operate and just generates a voltage in response to temperature changes, it is passive in nature. It only measures the temperature difference without supplying power to other devices.

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