A transformer supplies a low-voltage heating element used to warm a laboratory sample. The transformer is 100% efficient. The primary potential difference is 230 V, the primary current is 0.40 A and the secondary potential difference is 8.0 V.
Calculate the secondary current.
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.