definition
strict definition
windmill
A structure converting wind-driven blade motion into mechanical power for use on the same site or nearby.
A windmill is a structure which redirects energy from wind-powered blades into mechanical energy for use on the same site or nearby. Pumping water is one application of a windmill. This does not include the activity of wind turbines, which convert wind power into electricity.
The rotating blades drive work through a mechanical connection. Pumping water is one such task; the machinery uses the motion without first converting it to electricity.
A wind turbine driving an electrical generator has a different output. The windmill distinction concerns the direct mechanical use of wind power, rather than whether its work supports agriculture.
windmill Photos
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water mill
A place where flowing water is redirected into mechanical energy for use nearby.