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Hydel Energy

A windmill is...

Question

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

A

False

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True

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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. The blades of a windmill sweep out a circle of area A.
(a) If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t?
(b) What is the kinetic energy of the air?
(c) Assume that the windmill converts 25% of the winds energy into electrical energy, and that A = 30

m^{2}

, v = 36 km/h and the density of air is 1.2 kg

m^{3}

. What is the electrical power produced?

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

Q. A windmill converts wind energy into electrical energy. If v is the wind speed , then prove that electrical power output is proportional to v³ .

Q. Windmill converts ________ energy to electrical energy.

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