In which of the following sources of energy is the energy already present in nature as kinetic energy, which is then converted into electrical energy?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Wind energy
Moving air has kinetic energy. In a windmill this kinetic energy turns the blades, which drive an electric generator and produce electricity.
Why the other options are incorrect
Option (1) Ocean thermal energy — Incorrect. It uses the temperature difference between warm surface water and cold deep water, which is heat energy.
Option (2) Solar energy — Incorrect. A solar cell converts light energy of the Sun directly into electricity.
Option (3) Heat energy — Incorrect. In a thermal power plant heat from burning fuel first makes steam, which then runs the turbines.