Renewable Energy and Wind Turbines review for summative

What causes wind?

• Uneven heating of the earth’s surface

• Earth’s rotation

• Air moving from areas of high to low pressure

• All of the above

Hot air...

• Moves to an area of high pressure

• Sinks

• Rises

• Rotates

A generator...

• Converts mechanical energy into electrical energy

• Converts electrical energy into mechanical energy

• Spins turbines

• Increases turbine power

The speed and direction of wind at a specific location

• Density

• Efficiency

• Velocity

• Airfoil

At higher elevation, air density ...

• Increases

• Decreases

• Stays the same

Which type of power is easiest to control to meet energy demand?

• geothermal

• Solar

• Wind

• fossil fuels

The industrial revolution was sparked with the invention of this.

• wind turbines

• steam engine

• water mill

• airplane

Angular velocity is how fast the blades are spinning while ______ is how hard the blades are spinning.

• axis of rotation

• air density

• torque

• tangential force

A measure of force that causes an object to rotate around a fixed axis of rotation.

• angle of attack

• tangential force

• angular velocity

• torque

Which of the following increases torque?

• applying force close to the axis of rotation

• applying force directly above the axis of rotation

• applying force farther from the axis of rotation

• decreasing lift while increasing drag