An ideal transformer supplies the temperature-control circuit of an electric kiln. Its primary potential difference is 230 V. The secondary coil has 60 turns and supplies 11.5 V at a current of 4.0 A.
What are the number of turns on the primary coil and the primary current?
333 turns and 0.20 A0.20\ \mathrm{A}0.20 A
333 turns and 80 A80\ \mathrm{A}80 A
120012001200 turns and 80 A80\ \mathrm{A}80 A
120012001200 turns and 0.20 A0.20\ \mathrm{A}0.20 A
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.