Thermopile is used for the measurement of

• A. current
• B. flow rate
• C. emf
• D. temperature

Answer: (D)

The function of a thermopile is to transfer the heat radiation emitted from the object to a voltage output.
The output is in the range of tens or hundreds of millivolts.
Thermopiles are used to provide an output in response to temperature as part of a temperature measuring device