A museum display is powered by a battery. Switch M and lamp L are in the main wire before the wire divides into two branches. One branch contains switch S and lamp P in series. The other branch contains lamps Q and R in series. The branches then rejoin and return to the battery.
All four lamps are working correctly. Between Test 1 and Test 2, the position of exactly one switch is changed.
| Test | Lamp L | Lamp P | Lamp Q | Lamp R |
|---|---|---|---|---|
| 1 | lit | not lit | lit | lit |
| 2 | not lit | not lit | not lit | not lit |
Explain the positions of switches S and M during Test 1 and Test 2.
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.