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, 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.