A student investigates a parallel circuit with three branches. The supply potential difference is kept constant. A switch controls branch C. The student records the current in each branch.
| Branch current | Switch open | Switch closed |
|---|---|---|
| Branch A | 0.18 A | 0.18 A |
| Branch B | 0.24 A | 0.24 A |
| Branch C | 0.00 A | 0.31 A |
Calculate the current from the supply when the switch is closed.
Use the data in the table to explain what happens to the total resistance of the circuit when the switch is closed.
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.