Key ideas1 of 3
Cables and transformers
The National Grid links power stations to consumers using cables and transformers. Transmission lines carry electrical power over long distances.
Some cables are overhead and others are underground.
Physics Paper 1 · P2 · Lesson 2.14
The National Grid
Follow electricity from power stations to homes.
No timer. Read the explanation after each answer.
Lesson questions complete
Topic resources and sources
Daily 5 · Exam practice · Extra calculation practice · A4 revision sheet
Start with lessons 2.1–2.6 for the circuit basics. Lesson 2.15 offers extra calculation practice. The P2 specification content is shared by Foundation and Higher Tier; extra practice is not Higher Tier-only.
AQA Combined Science Trilogy specification · 6.2.4.3. Original notes, questions and diagrams. Circuit animations are simplified; motion is deliberately slowed. Measurements and example values are illustrative. All practical circuits use suitable supervised low-voltage apparatus.
Photographs: Photograph of the inside of a UK plug by Alby Reid, Public domain, released by the copyright holder; Electricity pylons near Grafham Water by Mat Fascione, CC BY-SA 2.0; Photoresistor 2 by oomlout, CC BY-SA 2.0. Images displayed without cropping or alteration.
