Question

Wind-turbine conversion devices based on drag force (a) move faster than was wind (b) move slower than was wind (c) move with equal velocity as was wind (d) do not depend on the velocity of the wind

Answer 1

Answer:

Option B

Explanation:

Wind energy conversion devices based on drag force move slower than wind because of all wind machines/turbines extract energy from wind through aerodynamics forces.

Answer 2

Answer:

Wind-turbine conversion devices based on drag force move slower than was wind.

Explanation:

• A wind turbine is a device that converts the kinetic energy of wind into electrical energy.
• A typical drag coefficient for wind turbine blades is 0.04; compare this to a well-designed automobile with a drag coefficient of 0.30.
• Even though the drag coefficient for a blade is fairly constant, as the wind speed increases, the amount of drag force also increases.
• The lower the drag coefficient number, the better the aerodynamic efficiency.