A greenhouse control panel receives power through transformer R and then transformer S. Transformer R feeds only transformer S, and both transformers are 100% efficient.
| Quantity | Value |
|---|---|
| Primary potential difference of R | 240 V |
| Primary current of R | 0.30 A |
| Secondary current of S | 3.0 A |
What is the secondary potential difference of S?
240 V240\ \mathrm{V}240 V
24 V24\ \mathrm{V}24 V
0.042 V0.042\ \mathrm{V}0.042 V
2400 V2400\ \mathrm{V}2400 V
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.