A theatre uses three coloured lamps. Fig. 8.1 shows the circuit for the coloured lamps, but it is incomplete.
(a)[3]
Complete the circuit diagram so that each lamp can be controlled separately for switching on and off, and the brightness of each lamp can also be varied.
(b)[1]
Suggest what switch X is used for.
(c)[3]
State the name of component Y and describe how it operates.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “circuit finished with 3 lamps connected in parallel” …