The current from a wind turbine generator varies sinusoidally. A sensor records the first and third occasions when the current reaches its maximum value in the direction from terminal P towards terminal Q.
| Recorded occasion | Time in s |
|---|---|
| First maximum from P towards Q | 0.0080 |
| Third maximum from P towards Q | 0.0580 |
Calculate the period of the current.
Use your answer to part (a) to describe the current at a time of 0.01425 s, including the direction in which it is about to flow.
81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.