A transformer that wastes no energy supplies a foam-cutting tool. The primary coil is connected to a 230 V alternating supply and has 920 turns. The secondary coil has 48 turns. When the tool is operating, the current in the secondary coil is 8.0 A.
Calculate the current in the primary 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.