"Windmills, which are used in the great plains of Holland and North Germany to supply the want of falling water, afford another instance of the action of velocity. The sails are driven by air in motion - by wind"

This quote by Hermann von Helmholtz is describing making use of windmills in Holland and North Germany to create power. Windmills are a kind of maker that utilizes the kinetic energy of the wind to turn a set of blades, which in turn drives a generator to produce electrical energy. The quote is highlighting the importance of velocity, or the speed of the wind, in order to create power. Without the wind, the sails of the windmill would not be able to turn and produce electrical energy. This quote is highlighting the significance of wind energy as a renewable energy source, and how it can be utilized to provide power to locations that do not have access to other forms of energy. Windmills are a fantastic example of how renewable energy sources can be used to provide power to locations that do not have access to other forms of energy.