JEE MAIN - Physics (2025 - 29th January Evening Shift - No. 4)
The difference of temperature in a material can convert heat energy into electrical energy. To harvest the heat energy, the material should have
low thermal conductivity and high electrical conductivity
low thermal conductivity and low electrical conductivity
high thermal conductivity and high electrical conductivity
high thermal conductivity and low electrical conductivity
Explanation
To harvest heat energy by converting a temperature difference into electrical energy, a material should have low thermal conductivity and high electrical conductivity. These materials are called thermoelectric materials.
The material should not readily transfer heat, allowing a significant temperature difference to be maintained between the hot and cold sides. So low thermal conductivity is necessary. High electrical conductivity is needed to allow the efficient movement of electrons when a temperature difference is present.
Hence, option 1 is correct.
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