Thermopile is used for the measurement of

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

Answer: (B)

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