NCERT Solution for Class 10 Science Chapter 14
Sources of Energy
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-253
Questions No-2
What are the limitations of the energy that can be obtained from the oceans?
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Energy from the oceans can be obtained in the form of tidal energy, wave energy and ocean thermal energy. But these energy sources suffer from the following limitations:
• There are very few locations where dams to utilise tidal energy can be built.
• Cost of installation of power houses is extremely high and efficiency of plants is comparatively small.
• Power plants built in oceans or at sea-shores will need high continuous maintenance as chances of corrosion are extremely high.
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The forms of energy that can be obtained from the ocean are tidal energy, wave energy, and ocean thermal energy. There are several limitations in order to harness these energies.
1. Tidal energy depends on the relative positioning of the Earth, moon, and the Sun.
2. High dams are required to be built to convert tidal energy into electricity.
3. Very strong waves are required to obtain electricity from wave energy.
4. To harness ocean thermal energy efficiently, the difference in the temperature of surface water (hot) and the water at depth (cold) must be 20ºC or more.
The energy from the oceans can be obtained mainly in three forms. These are
(i) tidal energy
(ii) wave energy and
(iii) ocean thermal energy
There are very few sites around the world which are suitable for building tidal dams.
The movement of ocean waves is associated with kinetic energy. Such sites in the world are limited where the waves strike the shore lines with sufficient power.
Limitations of energy which can be obtained from the oceans:
1. These forms of energy can be harnessed only in coastal areas; which would leave a vast portion of the human habitation.
2. The technologies for harnessing them are still at experimental stage and hence are very costly and less efficient.