A data logger is connected to an ammeter in the cable supplying a small water pump. The data logger calculates the total charge that has passed a point in the cable since the pump was switched on.
| Time in s\text{s}s | Total charge in C\text{C}C |
|---|---|
| 20 | 4.8 |
| 50 | 12.0 |
Calculate the mean current through the cable between 20 s and 50 s.
Immediately after 50 s, the current through the cable increases to 0.30 A and remains constant for the next 40 s. Calculate the total charge reading on the data logger at the end of the 40 s interval.
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.