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In practice, wind turbines use different types of generators that aren't very much like dynamos at all.(You can read about how they work, more generally, in our main article about generators.) If you've ever stood beneath a large wind turbine, you'll know that they are absolutely gigantic and mounted on incredibly high towers.
Even so, typical wind turbines stand idle about 14 percent of the time, and most of the time they don't generate maximum power.
This is not a drawback, however, but a deliberate feature of their design that allows them to work very efficiently in ever-changing winds. Cars don't drive around at top speed all the time: a car's engine and gearbox power the wheels as quickly or slowly as we need to go according to the speed of the traffic.
It can also capture wind coming from any direction without using things like pitch and yaw motors, which makes it simpler and cheaper.
Even so, turbines like this suffer from a variety of other problems and are quite inefficient at capturing energy, so they're very rare. At first sight, it's hard to imagine why anyone would object to clean and green wind turbines—especially when you compare them to dirty coal-fired plants and risky nuclear ones, but they do have some disadvantages.
That's not really a problem, because there's usually plenty more wind following on behind!
Ielts Academic Writing Test Papers - Uk Wind Farm Essay
It is a problem if you want to build a wind farm: unless you're in a really windy place, you have to make sure each turbine is a good distance from the ones around it so it's not affected by them.The longer the rotor blades, the more energy they can capture from the wind.The giant blades (typically 70m or 230 feet in diameter, which is about 30 times the wingspan of an eagle) multiply the wind's force like a wheel and axle, so a gentle breeze is often enough to make the blades turn around.So if you put a turbine's rotor blades high in the air, they capture considerably more wind energy than they would lower down.(If you mount a wind turbine's rotor twice as high, it will usually make about a third more power.) And capturing energy is what wind turbines are all about.The wind loses some of its kinetic energy (energy of movement) and the turbine gains just as much.As you might expect, the amount of energy that a turbine makes is proportional to the area that its rotor blades sweep out; in other words, the longer the rotor blades, the more energy a turbine will generate.Even a child's toy windmill is a simple form of turbine.The huge rotor blades on the front of a wind turbine are the "turbine" part.Notice how the white blades at the front connect via an axle (gray—under the engineer's feet) to the gearbox and generator behind (blue). A turbine, like the ones in a wind farm, is a machine that spins around in a moving fluid (liquid or gas) and catches some of the energy passing by.All sorts of machines use turbines, from jet engines to hydroelectric power plants and from diesel railroad locomotives to windmills.