A student investigates how adding identical bulbs in parallel affects the total current in a circuit.
They measure the total current from the power supply and the voltage across the circuit with 1, 2, and then 3 bulbs.
Table 1 shows their results.
Table 1
| Number of bulbs | Current in mA | Voltage in V |
|---|---|---|
| 4 | ? | 3.00 |
| 3 | 46.5 | 3.00 |
| 2 | 31.0 | 3.00 |
| 1 | 15.5 | 3.00 |
Using the data in Table 1, predict the current from the power supply when there are 4 bulbs connected in parallel in the circuit.
32 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current. Each one has a worked solution and a mark scheme showing where the marks go.