When heated, a thermocouple generates which type of electrical signal?

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Study for the NOCTI Heating, Ventilation, and Air Conditioning (HVAC) Test. Practice with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

When heated, a thermocouple generates which type of electrical signal?

Explanation:
When two dissimilar metals are joined and there’s a temperature difference, the Seebeck effect creates a small electromotive force. This manifests as a voltage whose polarity depends on which side is hotter. If the temperature difference is steady, the produced voltage is essentially constant, i.e., a direct current (DC) voltage. If the temperature varies, the voltage varies in kind with that change, but it’s still a voltage signal generated by the thermocouple, not an AC waveform or a pulsed current by itself. A thermocouple does not inherently produce a change in resistance as its primary signal.

When two dissimilar metals are joined and there’s a temperature difference, the Seebeck effect creates a small electromotive force. This manifests as a voltage whose polarity depends on which side is hotter. If the temperature difference is steady, the produced voltage is essentially constant, i.e., a direct current (DC) voltage. If the temperature varies, the voltage varies in kind with that change, but it’s still a voltage signal generated by the thermocouple, not an AC waveform or a pulsed current by itself. A thermocouple does not inherently produce a change in resistance as its primary signal.

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