A small waterwheel turns a generator at a steady rate. The potential difference is measured at equal angular positions during one complete rotation of the coil.
The readings are shown in the table.
| Angular position of coil | Potential difference |
|---|---|
| 0∘0^\circ0∘ | 0.0 V |
| 45∘45^\circ45∘ | +3.0 V |
| 90∘90^\circ90∘ | +4.2 V |
| 135∘135^\circ135∘ | +3.0 V |
| 180∘180^\circ180∘ | 0.0 V |
| 225∘225^\circ225∘ | +3.0 V |
| 270∘270^\circ270∘ | +4.2 V |
| 315∘315^\circ315∘ | +3.0 V |
| 360∘360^\circ360∘ | 0.0 V |
State whether the generator uses slip rings or a split-ring commutator. Explain your answer.
92 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.