A transformer supplies low-voltage lamps in a display cabinet. Its primary coil has 1200 turns and is connected to a 230 V alternating supply. The primary current is 0.115 A. The lamps require a secondary current of 2.3 A. The transformer is 100% efficient.
Calculate the number of turns on the secondary coil.
108 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid, covering 13.2.1 Transformers and induction, 13.2.2 The transformer turns-ratio equation, 13.2.3 The National Grid, 13.2.4 The transformer power equation, and 13.2.5 Advantages of high-voltage transmission. Each one has a worked solution and a mark scheme showing where the marks go.