Which outcome occurs in a thermoelectric generator when the hot side temperature gradient decreases below the design threshold?

💡 Explanation

When the hot side temperature decreases, the thermal gradient reduces, diminishing the Seebeck effect as fewer charge carriers are driven across the material due to a smaller temperature difference. Therefore, Seebeck voltage generation is reduced, rather than increased resistance, enhanced heat transfer, or polarity reversal, which require different driving conditions such as material degradation or improper connections.

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