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13.2 Transformers and the National Grid

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Question 27

A technician tests a transformer before it is installed in an access-control system. An ammeter measures the current in the secondary circuit.

The transformer is treated as 100% efficient.

quantityvalue
primary potential difference230 V
primary current0.48 A
secondary potential difference24 V

Use the equation

VpIp=VsIsV_{\mathrm{p}}I_{\mathrm{p}}=V_{\mathrm{s}}I_{\mathrm{s}}Vp​Ip​=Vs​Is​

Calculate the reading on the ammeter.

[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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