### vertical mill power equation - Auto Gyro Africa

account the other factors in a complete wind turbine system - e.g. the gearbox, bearings, generator and so on - only 10-30% of the power of the wind is ever actually converted into usable electricity. Hence, the power coefficient needs to be factored in equation (4) and the extractable power from the wind is given by: P avail Av C p 3 2 1 = ρ .(5)