A student uses a 9.0 V supply to investigate a reference resistor and an unknown resistor, XXX. The measurements are shown in the table.
| Circuit | Components | Current |
|---|---|---|
| A | Reference resistor | 1.5 A |
| B | Reference resistor and X X\,X in series | 0.60 A |
Use the measurements to calculate the resistance of XXX.
The student adds a 3.0 Ω resistor in series with the components in Circuit B, leaving the supply unchanged. Calculate the current.
94 exam-style questions on AQA GCSE Physics 2.2 Series and parallel circuits, covering 2.2 Series and parallel circuits. Each one has a worked solution and a mark scheme showing where the marks go.