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Wind Power

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  • Why is a windmill called by that name?
    It uses the power of wind when milling grains.
  • 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 two things cause air to move?
    The sun and Earth's rotation
  • 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
  • What is the process called whereby grains are grinded into powder form?
    Milling
  • 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
  • What is wind?
    The movement of air
  • 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 is the main driver of wind?
    The sun's warmth
  • Which set of people used to use wind to power their sailboats along the river Nile?
    Ancient Egyptians
  • Give 3 ways in which we can use wind.
    To sail ships, pump water, make electricity, mill grain...
  • 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.
  • 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's a wind farm?
    A place with many wind turbines which are used to make electricity.
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