A machine has a rotating shaft that can operate at either 900 rpm or 1200 rpm. The shaft drives the coil of a generator that supplies a monitoring circuit.
The monitoring circuit requires:
The generator can be fitted with either two slip rings or a split-ring commutator.
The table shows measurements of the potential difference induced across the coil.
| Operating speed (rpm) | Peak potential difference during one half-turn (V) | Peak potential difference during the next half-turn (V) |
|---|---|---|
| 900 | +9 | −9 |
| 1200 | +12 | −12 |
Which connection system and operating speed should be used? Explain your answer.
96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.