A maintenance manual treats four transformers used in railway signalling equipment as 100% efficient. One current has been copied incorrectly into the maintenance record.
| Record | Primary potential difference / V\mathrm{V}V | Primary current / A\mathrm{A}A | Secondary potential difference / V\mathrm{V}V | Secondary current / A\mathrm{A}A |
|---|---|---|---|---|
| J | 230 | 0.12 | 46 | 0.60 |
| K | 120 | 0.30 | 24 | 1.5 |
| L | 48 | 0.75 | 12 | 2.0 |
| M | 24 | 2.0 | 96 | 0.50 |
Which record contains the incorrectly copied current?
Record K
Record L
Record M
Record J
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.