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13.2 Transformers and the National Grid

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Question 35

A laboratory technician is checking three transformers. Each record gives the measured potential differences and coil turns for one transformer, with one value missing.

Calibration record 1:

  • Primary potential difference: 240 V
  • Secondary potential difference: 12 V
  • Primary coil: unknown number of turns
  • Secondary coil: 80 turns

Calibration record 2:

  • Primary potential difference: 18 V
  • Secondary potential difference: unknown
  • Primary coil: 120 turns
  • Secondary coil: 800 turns

Calibration record 3:

  • Primary potential difference: unknown
  • Secondary potential difference: 6.0 V
  • Primary coil: 900 turns
  • Secondary coil: 30 turns

Use the equation

VPVS=NPNS\displaystyle \frac{V_P}{V_S} = \frac{N_P}{N_S}VS​VP​​=NS​NP​​

Calculate the missing value in each calibration record.

[3]
Markscheme

13.2 Transformers and the National Grid Questions

  1. GCSE
  2. /Physics
  3. /13.2 Transformers and the National Grid

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.

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