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Do thermocouples use AC or DC?

in Electrical Engineering

Do thermocouples use AC or DC?

1 Answer

Thermocouples **do not use AC or DC** in the traditional sense like batteries or power supplies.

Instead, **they generate a small DC voltage** on their own when there is a temperature difference between their two junctions. This is due to the **Seebeck effect** — when two different metals are joined together and one junction is heated, a small voltage is created.

So in short:

* **Thermocouples generate DC voltage** (very small, usually in millivolts).
* They **do not need an external power supply** (AC or DC) to work.

Would you like a simple diagram or example showing how it works?

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