Question 3:
How has the traditional use of wind and water energy been modified for our
convenience?
Answer:
Traditionally, waterfalls were used as a source of potential energy which was
converted to electricity with the help of turbines. Since waterfalls are few in
number, water dams have been constructed in large numbers. Nowadays,
hydro-dams are used in order to harness potential energy of stored water.
In water dams, water falls from a height on the turbine, which produces
electricity.
Earlier, the windmills were used to harness wind energy to do mechanical
work such as lifting/drawing water from a well. Today, windmills are used
to generate electricity. In windmills, the kinetic energy of wind is harnessed
and converted into electricity. The rotatory motion of the blades turns the
turbine of the electric generator to generate electricity.
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