ESCO Electrical Employment Ready Practice Test

A thermocouple can:

Generate a small DC current Generate a large AC voltage Act as a resistor Store energy

Correct Answer:

Generate a small DC current

Explanation:

A thermocouple works by converting a temperature difference into electricity through the Seebeck effect, so it acts like a small DC voltage source. In a circuit, that voltage can push current, so it’s reasonable to say it can generate a small DC current in a closed loop. It doesn’t inherently produce large AC voltage—the output is a small, usually DC, voltage unless specific circuitry or temperature cycling creates AC behavior. It’s not a resistor and it doesn’t store energy; it’s a heat-to-electricity transducer, not a passive resistive element or a storage device.

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