A student tests a resistor of unknown resistance by connecting it in series with a 15 Ω resistor and a 9.0 V d.c. supply. The resistance of each resistor stays constant throughout. The student measures the potential difference across each resistor.
| Resistor | Potential difference in V |
|---|---|
| 15 Ω resistor | 3.0 |
| Unknown resistor | 6.0 |
Calculate the resistance of the unknown resistor.
The student adds a second 15 Ω resistor in series with the other components. Calculate the current in the circuit.
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.