A graph of output potential difference against time shows a series of humps that never fall below the time axis. Which device produced the output, and why?
An alternator, because the slip rings swap the connections every half turn
An alternator, because the connections to the coil are never swapped over
A dynamo, because the split ring swaps the connections every half turn
A dynamo, because the connections to the coil are never swapped over
40 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.