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Wind Mills

How does the ...

Question

How does the wind move the blades of a windmill ?

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Solution

A Windmill is a machine which converts the energy of wind into rotational energy by means of vanes called blades.
We know that a moving object can do work and also objects in motion possess kinetic energy. Blowing wind also posses energy which is used to move the blades.

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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. If the wind flows at a velocity v perpendicular to the circle and its density is

ρ

, what is the mechanical power received by the windmill?

Q. Consider the following processes:
1. Wind rotates the blades of the windmill.
2. Electrical energy produced.
3. Turbine rotates.
4. Blowing of wind.
Which of the following predicts the correct order of events?

Q. The blades of a windmill sweep out a circle of area

A

. If the wind flows at a velocity

v

perpendicular to the circle, then the mass of the air of density

ρ

passing through it in time

t

Sara has designed the blades of a windmill as shown in the diagram above, the total area (in sq. cm) covered by the blades is.

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