Final answer:
When two or more thermocouples are connected in series to increase the output voltage from the sensor, the connection is referred to as a thermopile.
Step-by-step explanation:
In physics, when two or more thermocouples are connected in series to increase the output voltage from the sensor, the connection is referred to as a thermopile.
A thermocouple is a device used to measure temperature by utilizing the principle of the Seebeck effect, which states that the junction of two dissimilar metals generates a voltage proportional to the temperature difference between the junction and the other end of the circuit.
By connecting multiple thermocouples in series, the individual voltages produced by each thermocouple add up, resulting in a higher output voltage. This can be useful in applications where higher sensitivity or greater temperature range is required.