An alternating potential difference of 240 V is applied across the primary coil of a step-down transformer. This produces a potential difference of 12 V across the secondary coil. The primary coil has 3000 turns.
Calculate the number of turns in the secondary coil. Use the equation:
potential difference across primary coilpotential difference across secondary coil=number of turns on primary coilnumber of turns on secondary coil \frac{\text{potential difference across primary coil}}{\text{potential difference across secondary coil}} = \frac{\text{number of turns on primary coil}}{\text{number of turns on secondary coil}} potential difference across secondary coilpotential difference across primary coil=number of turns on secondary coilnumber of turns on primary coil28 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid. Each one has a worked solution and a mark scheme showing where the marks go.