Product Description
Video and lesson investigations on the topic of windmills and wind energy. Key concepts include:
- Moving air can be used to drive machinery.
- The windmill only works when the sails are facing the wind.
- The sails on the windmill turn when the wind blows against them.
- The force of the wind turns the sails.
- This produces movement which is transferred to machinery inside the mill. The driving force is regulated and changed by cog-wheels and drive shafts. This enables millstones to grind corn into flour.
- Vertical movement is transferred into horizontal movement.
- Wind is a source of free energy.
- Wind is one of the earliest forms of energy to be used by humans.
- The Chinese are thought to have used windmills for irrigation as early as 2000 BC.
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