An alarm unit contains a sounder and a lamp connected one after another in a single loop with a cell. An ammeter is used to measure the current at different positions in the circuit.
| Ammeter position | Location | Current in A |
|---|---|---|
| A | Between the cell and the sounder | 0.28 |
| B | Between the sounder and the lamp | 0.28 |
| C | Between the lamp and the cell | Not measured |
A student predicts that the current at position C will be less than 0.28 A because the lamp uses some of the current.
Explain why the student's prediction is incorrect. State the expected ammeter reading at position C. Use the data in the table in your answer.
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.