Skip to content

Course home

Sign up

13.2 Transformers and the National Grid

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
Question 17

During a test of the transformer in the low-voltage power supply for an audio mixing desk, a data logger produces the following entries. The transformer transfers energy without any losses.

QuantityData-logger entry
primary potential difference240 V
secondary potential difference5.0 V
primary current0.25 A
secondary current2.0 A

Checks with separate meters confirm the primary potential difference and both current readings. A fault affected the data-logger channel that stored the 5.0 V entry.

By what factor should the engineer multiply the 5.0 V entry to give the correct secondary potential difference?

[1]
A

16\dfrac{1}{6}61​

B

888

C

484848

D

666

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.

Question bank