A 9.0 V battery is connected to two parallel branches. Branch X contains a switch and a resistor. Branch Y contains an 18 Ω resistor. The connecting wires have negligible resistance. The switch in branch X is opened.
Explain what happens to the potential difference across the resistor in branch Y. Calculate the current in this resistor after the switch is opened.
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.