Extra TopicsHigh Exam FrequencyAQA

National Grid & Transformers

Revise National Grid & Transformers in Extra Topics for GCSE Physics with 13 exam-style questions and 12 flashcards. This is a high-frequency exam topic, so students should expect to explain it clearly under timed conditions.

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The Cleverest Solution in Engineering History

Introduction 2

How the National Grid Works

Deep Dive 3

How Transformers Work

Deep Dive 4

The Transformer Equations

Worked Examples

Key Terms

Key Facts

Common Misconceptions

Misconceptions 9

Memory Aids

Memory Aid 10

Exam Focus — National Grid and Transformers

Exam Focus 11

Exam Tips for National Grid and Transformers

Exam Tips 12

Topic Summary: National Grid and Transformers

Summary

Sample Flashcards

How does a transformer work?

AC in primary creates changing magnetic field → iron core transfers field to secondary → changing field induces voltage in secondary (electromagnetic induction)

What voltage do homes receive?

230 V

Sample Questions

What is the function of a step-up transformer in the National Grid?

A. To increase current and decrease voltage for transmission
B. To increase voltage and decrease current for transmission
C. To convert AC to DC for transmission
D. To store electrical energy during low-demand periods

1 markfoundation

Explain why electricity is transmitted at high voltage and low current through the National Grid power cables.

3 marksstandard

exam-style questions

revision flashcards

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