Awind turbine works by slowing the air that passes its blades and converting much of the extracted kinetic energy to electric energy. a large wind turbine has 45-m-radius blades. in typical conditions, 92,000 kg of air moves past the blades every second. if the air is moving at 12 m/s before it passes the blades and the wind turbine extracts 40% of this kinetic energy, how much energy is extracted every second?

2649600 Joules

Explanation:

Efficiency = 40%

m = Mass of air = 92000 kg

v = Velocity of wind = 12 m/s

Kinetic energy is given by

The kinetic energy of the wind is 6624000 Joules

The wind turbine extracts 40% of the kinetic energy of the wind

The energy extracted by the turbine every second is 2649600 Joules

hello there!

your answer is a “generator”

a generator does not create energy but instead it transforms it.

it’s basically a motor working in reverse.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6