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13.2 Transformers and the National Grid

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Question 35
F

A transformer is 100% efficient. Its primary is connected to a 230 V supply. Its secondary supplies identical lamps, each rated at 12 V and 6.0 W, connected in parallel.

The primary current must not exceed 0.10 A.

What is the greatest number of lamps that can operate at their rated power?

[1]
A

222

B

444

C

333

D

555

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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