A battery supplies three lamps in a miniature theatre.
The circuit first divides into two paths. The connections are described in the table.
| Path or switch | Connection |
|---|---|
| First path | Foyer lamp and switch A |
| Second path | Switch B, followed by a division into two smaller branches |
| First smaller branch | Stage lamp and switch C |
| Second smaller branch | Exit lamp |
| Switch D | In the main wire before the circuit first divides |
All four switches are initially closed and all three lamps are lit.
Which switch should be opened to make the Stage and Exit lamps go out while the Foyer lamp remains lit?
Open switch B only
Open switch D only
Open switch A only
Open switch C only
94 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.