Question

Windmills typically capture all of the energy in the wind as long as the wind speeds are more than 20 kmph

Answer 1

It should be false.But still go through lecture once.

Answer 2

No, the given statement is false.

Windmills cannot capture all the energy. Even though it captures most of the energy in the wind as long as the windmill speed is higher than 20 kmph because a typically small turbine starts its rotation within 8 kmph and it starts its power generation after 12.6 kmph.

Though the turbine starts its power generation at 12.6 the maximum power generation of a turbine takes place only at 36-54 kmph. The turbine breaks its generation at 90 kmph.

We can never get 100% efficiency from any mechanism.