Discussion
Ocean thermal energy is due to
Answer: C
Ocean thermal energy is due to the temperature difference at different levels in the ocean.
In tropical seas, surface water is warmed by the sun to about 25-28 °C while water a kilometre down stays at about 5 °C. Ocean thermal energy conversion (OTEC) uses that difference of 20 °C or more to run a heat engine, typically by vaporising a working fluid such as ammonia with warm water and condensing it with cold water.
Tides produce tidal energy and waves produce wave energy, both of which are separate technologies. Pressure differences with depth are not used to generate this kind of power.
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