(a)[2]
State two advantages of circuit B over circuit A.
(b(i))[1]
Calculate the useful energy output, in one second, of the lamp.
(b(ii))[1]
In the space below, draw a labelled diagram, similar to Fig. 5.2, for a lamp that is more efficient.
(c)[4]
State two advantages and two disadvantages of using wind turbines, instead of fossil fuels, to generate electricity.