A pedal-powered generator produces a sinusoidal current with a frequency of 40 Hz. A data logger records an instant when the current is zero and beginning to flow from P to Q.
Which describes the current 0.0125 s later?
Zero, and beginning to flow from P to Q.
Maximum, and flowing from Q to P.
Maximum, and flowing from P to Q.
Zero, and beginning to flow from Q to P.
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.