An alternating power supply is connected to the primary coil of a step-down transformer.
Describe how this power supply causes a changing magnetic field to be set up in the transformer's iron core.
Practise Edexcel GCSE Physics Transformers and the national grid with exam-style questions for Foundation and Higher tier. 47 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.