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7.3 Induced potential, transformers and the National Grid (HT only)

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Question 25
H

Step-up transformers are used before electrical power is transmitted across the National Grid. Why does this reduce the energy wasted in the cables?

[1]
A

A higher potential difference gives the cables a lower total resistance

B

A higher potential difference means a smaller current for the same power

C

A higher potential difference makes the charge travel along the cables faster

D

A higher potential difference means less power is carried by the cables

Markscheme

7.3 Induced potential, transformers and the National Grid (HT only) Questions

  1. GCSE
  2. /Physics
  3. /7.3 Induced potential, transformers and the National Grid (HT only)

40 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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