a) Peltier effect
b) See-beck effect
c)Joule effect
d) Thomson effect
Answer: a
Explanation: In the Peltier effect, which is the inverse of the See-beck effect, an electric current is sent through a junction of two dissimilar materials results in either a cooling or heating of the junction. When the current flows in the direction of the potential drop of the junction, then the junction’s temperature decreases and thus has a refrigerating effect.
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