Peltier effect can be used
(A) only for cooling a substance
(B) only for heating a substance
(C) for cooling and heating a substance
The correct answer is:
(C) for cooling and heating a substance
Explanation:
The Peltier effect refers to the heating or cooling that occurs when an electric current passes through the junction of two different conductors or semiconductors. Depending on the direction of the current:
- One side of the junction absorbs heat (causing cooling),
- The other side releases heat (causing heating).
This principle is used in thermoelectric coolers and heaters, allowing devices to be used for both heating and cooling applications by reversing the current direction.
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