A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.

(i) Name the form of energy.

(ii) Is this energy ultimately derived from the sun or not?

(iii) Explain, how this form of energy can be converted into electricity?

(i) Ocean thermal energy due to difference in water’s temperature at surface and deep inside the water.

(ii) This form of energy is ultimately derived from sun because it is the sun rays which are causing the upper surface of the ocean to heat up and cause the temperature difference.

(iii) The warm water of the surface is used to boil a volatile liquid like ammonia and the vapors of the liquid cause the turbine to rotate and the cold water the lower levels are used to condense this gas to turn it to liquid and the process continues.