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What is wind?
The movement of air
How does the sun help to create wind?
As sunlight hits the Earth, it warms the air. The warm air is lighter so it rises while the cool air sinks. This movement creates wind.
What two things cause air to move?
The sun and Earth's rotation
What is the main driver of wind?
The sun's warmth
How does Earth's rotation help to create wind?
The land and ocean move and drag the air around while the Earth is rotating.
Give 3 ways in which we can use wind.
To sail ships, pump water, make electricity, mill grain...
What is the process called whereby grains are grinded into powder form?
Milling
Why is a windmill called by that name?
It uses the power of wind when milling grains.
What is a wind turbine used for?
A wind turbine turns wind energy into electricity.
True or false, using wind as a source of energy is a new idea?
False, people have been doing this for thousands of years
Which set of people used to use wind to power their sailboats along the river Nile?
Ancient Egyptians
What were the 2 main uses of windmills in the middle east regions 1500 years ago?
To grind grain and draw water
Where were the first windmills used?
Persia
What is torque?
The rotational energy that is converted by the rotor blades of the windmill from the wind's energy.
How much torque is produced depends on 3 things, what are they?
Air density, wind speed and the length of the rotor blades
What's a wind farm?
A place with many wind turbines which are used to make electricity.
