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WalesCombined Science

WJEC GCSE Science Double Award: Electricity and the grid (Unit 3, Physics 1) overview

An overview of the Electricity and the grid module in WJEC GCSE Science Double Award (Unit 3, Physics 1), mapping current, potential difference and resistance, series and parallel circuits, domestic electricity and safety, generators and transformers, and the National Grid.

Generated by Claude Opus 4.86 min readDouble Award Unit 3 (Physics 1)

Reviewed by: AI editorial process; not yet individually human-reviewed

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  1. The topics in this module
  2. How this module fits the exam
  3. How to study this module

The Electricity and the grid module gathers the electricity content of Physics 1 in WJEC GCSE Science Double Award. It explains how circuits work, how mains electricity is used safely at home, and how electricity is generated and carried across the country. This page maps the module and links to a focused answer page for each part.

The topics in this module

Current, potential difference and resistance
The three quantities, V = IR, and the current-voltage graphs. See Current, potential difference and resistance.
Series and parallel circuits
The current and voltage rules and how resistance combines. See Series and parallel circuits.
Domestic electricity and safety
Mains a.c., the three wires, fuses, earthing and P = IV. See Domestic electricity and safety.
Generators and transformers
Electromagnetic induction and how transformers change voltage. See Generators and transformers.
The National Grid
The structure of the grid and why high voltage is used. See The National Grid.

How this module fits the exam

These topics sit in Unit 3 (Physics 1), a written paper of 1 hour 15 minutes worth 15%. Questions mix recall (rules, wires), calculation (V = IR, P = IV, transformers) and explanation (graphs, safety, the grid).

How to study this module

  1. Master the equations. V = IR, P = IV and the transformer equation, with rearranging and units.
  2. Learn the graphs. Resistor (straight line), filament lamp (curve), diode (one direction).
  3. Apply the circuit rules. Current and voltage in series and parallel, and how resistance combines.
  4. Understand safety. The three wires, fuses, circuit breakers and earthing.
  5. Know induction and the grid. Generators, transformers, and why high-voltage transmission is efficient.

Then test yourself with the module quiz.

Sources & how we know this