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What is a renewable energy source? Give 2 examples.
It's a source of energy that never runs out. Eg. wind and solar energy...
What's a wind farm?
A place with many wind turbines which are used to make electricity.
How much torque is produced depends on 3 things, what are they?
Air density, wind speed and the length of the rotor blades
What is torque?
The rotational energy that is converted by the rotor blades of the windmill from the wind's energy.
Where were the first windmills used?
Persia
What were the 2 main uses of windmills in the middle east regions 1500 years ago?
To grind grain and draw water
Which set of people used to use wind to power their sailboats along the river Nile?
Ancient Egyptians
True or false, using wind as a source of energy is a new idea?
False, people have been doing this for thousands of years
What is a wind turbine used for?
A wind turbine turns wind energy into electricity.
Why is a windmill called by that name?
It uses the power of wind when milling grains.
What is the process called whereby grains are grinded into powder form?
Milling
Give 3 ways in which we can use wind.
To sail ships, pump water, make electricity, mill grain...
How does Earth's rotation help to create wind?
The land and ocean move and drag the air around while the Earth is rotating.
What is the main driver of wind?
The sun's warmth
What two things cause air to move?
The sun and Earth's rotation
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 is wind?
The movement of air


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