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Wind Mill

Windmills uti...

Question

Windmills utilise the kinetic energy of _____.

A

wind on the Earth

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B

water on the Earth

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C

heat from the Sun

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D

light from the Sun

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Solution

The correct option is A wind on the Earth
A windmill uses the kinetic energy of the wind to produce electricity. The blades of a windmill rotate due to the speed of the wind. This rotates the turbines and generates electricity. Therefore, wind energy gets converted to electrical energy in a windmill.

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Q. Windmill utilizes the kinetic energy of which resource?

Q. Question 14
Choose the incorrect statement regarding wind power.

(a) It is expected to harness wind power to minimum in open space.
(b) The potential energy content of wind blowing at high altitudes is the source of wind power.
(c) Wind hitting at the blades of a windmill causes them to rotate The rotation thus achieved can be utilised further.
(d) One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine.

Q. What is kinetic energy? What does the kinetic energy of a body depend on ? Give one example to illustrate how kinetic energy can be utilised to do useful work.

Q. The blades of windmill sweep out a circle of area A . (a) if the wind flows at a velocity v perpendicular to circle , what is the mass of the air passing through in time t ? (b) what is the kinetic energy of the air ? (c) Assume that the windmill converts 25% of the wind's energy into electrical energy , and that A = 30m³, v = 36 km / h and the density of air is 1.2 kg m^-3. What is the electric power produced ?

Q. A windmill is a machine that converts wind energy to rotational energy.

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