How Wind Turbines Work?
Wind turbines use blades to collect the wind's kinetic energy. Wind flows over the blades creating lift (similar to the effect on Aeróplane wings), which causes the blades to turn.
The blades are connected to a drive shaft that turns an electric generator, which produces (generates) electricity.
How Are Wind Turbines Assembled?
Why Do Wind Turbines Have Three Blades?
Adding a fourth blade provides such a marginal increase in performance that it does not justify the additional cost, the blades are very expensive.
A two bladed design can match the performance of a 3 bladed design by increasing the chord of the blade by 50%, which eliminates the cost advantage so that’s pointless.
Two blades wind turbines can also spin faster, which is a negative. A faster spinning blade will generate more noise, also the weight increases.
A three blade design can generate more power and it is more cost effecient.
Pros:
Wind Turbines are one of the most efficient at producing green energy. It doesn't use any fossil fuels to run, and it doesn't release anything toxic into the air.
Cons:
As with any construction within wildlife area, there is some habitat loss, as any wild life living in the area are forced to relocate.
There is the risk of birds flying into the blades; it doesn't happen often.
Misconceptions:
Wind turbines can make you sick, causing Wind Turbine Syndrome.
This is false. Wind Turbine Syndrome is merely psychosomatic; it can be brought on by belief that wind turbines would cause you to become ill.
The brain is a powerful thing, if you take a group of people and convince them that something will make them ill, they will experience symptoms from the belief that they should be feeling ill.
Wind turbines can demish a persons mental health, if they live close enough to hear the sound (if one finds it unpleasant) or shadow flicker.
Fortunately, the wind turbines will be placed far enough away from residential dwellings, and the max range the sound carries, at the highest rotation speed, should be no more then a few hundred feet.
This video below may be helpful.