All else being equal, turbines will produce more power at lower elevations and in locations with cooler average temperatures. Swept area of the turbine: The larger the swept area (the size of the area through which the rotor spins), the more power the turbine can capture from the wind. Since swept area is, where r = radius of the rotor, a small increase in

a) Turbines are most efficient in high-elevation locations.
b) Turbines generate more power in warmer temperatures.
c) Swept area is unrelated to the power production of turbines.
d) Lower elevations and cooler temperatures enhance turbine power production.