In a test, the current in the primary coil of a transformer is increased from one steady value to a higher steady value without changing direction. It is then held at the higher value.
Explain why a potential difference is induced across the secondary coil while the primary current is increasing, but not while the current is held steady.
State what type of current in the primary coil would produce a continuous output from the transformer.
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.