A resistor bank contains a 12 Ω resistor and an 18 Ω resistor connected in series across a 6.0 V d.c. supply. The resistor bank operates for 2.0 minutes2.0\ \text{minutes}2.0 minutes.
Calculate the charge that passes through the 18 Ω resistor during this time.
The two resistors are reconnected in parallel and operated for another 2.0 minutes2.0\ \text{minutes}2.0 minutes. The potential difference across the combination remains 6.0 V. Explain how the charge that flows from the supply in this time compares with the charge that flowed from the supply in part (a).
82 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.