A field laboratory uses a transformer to supply an instrument that needs a potential difference of 12 V. The primary coil is connected to a 230 V alternating supply.
| Primary turns | Secondary turns |
|---|---|
| 1800 | 120 |
A technician says that the secondary coil needs fewer turns for the transformer to supply the potential difference the instrument needs.
Calculate the secondary potential difference and state whether the technician is correct. Give a reason for your answer.
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.