(a)[1]
Name the energy store held in the battery.
(b)[1]
State one benefit of a parallel connection in a lighting circuit.
(c(i))[1]
State what 22% efficiency means.
(c(ii))[2]
Calculate the solar power input to the solar cell.
(d)[2]
Suggest two advantages of using a solar cell to power the traffic warning lights in Fig. 2.1 instead of using mains electricity.