An electric pump operates with a steady current. A charge counter records the total charge that has passed through the pump.
| Time / s | Charge-counter reading / C |
|---|---|
| 20 | 420 |
| 50 | 510 |
The pump is then operated at the same steady current for 80 s. During this time, it transfers 2.88 kJ of energy.
Calculate the potential difference across the pump.
94 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.