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Which non-conventional energy source uses temperature difference between sea-surface water and deep ocean water?
ATidal energy
BWave energy under typical conditions
COTEC (ocean thermal energy conversion)
DGeothermal energy
Answer & Solution
Correct answer: C. OTEC (ocean thermal energy conversion)
1. OTEC stands for Ocean Thermal Energy Conversion.
2. It uses the temperature gap between warm surface water and cooler deep water.
3. Warm water vaporises a low-boiling-point liquid (such as ammonia).
4. The vapour drives a turbine to generate electricity.
5. The cool deep water condenses the vapour back to liquid.
6. So OTEC needs the surface-deep temperature gradient.
_Source: NCERT Class 10 Science Ch 14 'Sources of Energy' (byjus.com extract)_
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