Replacement of Oxygen in the Atmosphere

When wind strikes the blades, a _____ difference is created between different regions which produces a turning effect and the blades rotate.

Circulation of oxygen in various forms through nature is called _____. (Oxygen cycle/Carbon cycle)

Name the energy used to generate electricity by windmills.

Electricity is generated in _____ by wind.

The percentage of oxygen in the air does not change because

Windmills use the energy of the sun. 

Where does the windmill draw water from? (Wells / Plants)

Windmill provides us:

Windmills use the energy of moving air.

What do you do to make the windmill rotate continuously?

Why do wind mills and paper flowers rotate?

Take a square shaped paper. Fold the paper into half and fold it further to make it square again. Now fold it vertically and horizontally. Now it looks like a flower. Place this on the tip of the pencil lead and blow air through your mouth. This acts like a windmill.

How long does it rotate?

Take a square-shaped paper. Fold the paper into half and fold it further to make it square again. Now fold it vertically and horizontally. Now it looks like a flower. Place this on the tip of the pencil lead and blow air through your mouth. This acts like a windmill.

Does it rotate in all directions?

Take a square-shaped paper. Fold the paper into half and fold it further to make it square again. Now fold it vertically and horizontally. Now it looks like a flower. Place this on the tip of the pencil lead and blow air through your mouth. This acts like a windmill.

Which direction does your windmill rotate?

How does large-scale deforestation and burning of fossil fuel affect the oxygen cycle? Discuss with your teacher.

How is the concentration of oxygen maintained in the atmosphere? Make a flow chart to support your answer.

How can we use air to make electricity?

Draw windmills that generate wind electricity.

What are the uses of these fans?

Do you know how they run? Where do you find them?