(a)[2]
State one advantage and one disadvantage of using a wind turbine as a source of electrical energy.
(b(i))[4]
Calculate: 1. the mass of air that passes through the circular area swept out by the blades in 1.0 s 2. the kinetic energy of the mass of air that passes through the area swept out by the blades.
(b(ii))[1]
Suggest why some of the kinetic energy of the air that passes through the circular area swept out by the blades is not converted into electrical energy.