What is the term for the connection of two or more thermocouples in series to increase output voltage?

• A. Parallel wiring
• B. Series connection
• C. Thermopile
• D. Delta connection

Answer: (C)

When several thermocouples are connected in series, the small voltages each junction generates add up, giving a higher total output for the same temperature difference. The assembled bundle of thermocouples wired in this way is called a thermopile. This name specifically refers to the series-connected collection that yields increased voltage. Parallel wiring would boost current rather than voltage, and delta connection isn’t a standard term used for this thermocouple arrangement. So the term that best fits for the series-connected group to raise output voltage is thermopile.