# 6 Magnetism – Part D “Induction”

### Syllabus Aims…

6.15 know that a voltage is induced in a conductor or a coil when it moves through a magnetic field or when a magnetic field changes through it and describe the factors which affect the size of the induced voltage.

6.16 describe the generation of electricity by the rotation of a magnet within a coil of wire and of a coil of wire within a magnetic field and describe the factors which affect the size of the induced voltage.

6.17P describe the structure of a transformer, and understand that a transformer changes the size of an alternating voltage by having different numbers of turns on the input and output sides (Triple)

6.18P explain the use of step-up and step-down transformers in the large scale generation and transmission of electrical energy  (Triple)

6.19P know and use the relationship between input (primary) and output (secondary) voltages and the turns ratio for a transformer: (Triple)

input (primary) voltage / output (secondary) voltage = primary turns / secondary turns

$VpVs=NpNs$

6.20P know and use the relationship:  (Triple)

input power = output power      (for 100% efficiency).

### Resources…

Use this PowerPoint for all lesson ideas… 6D Electromagnetic Induction 8 to 11

### Useful Videos…

Ken Campbell – Six Experiments That Changed the World – Faraday and the Doughnut

### Extension Ideas…

https://www.en.wikipedia.org/wiki/Transformer

## GCSE Physics - Generator Effect / Electromagnetic Induction #81

This video covers:
- The idea that the movement of a wire within a magnetic field induces a potential difference, and that this may lead to a current if the circuit
is complete
- How we can increase the size of the current
- What happens when we place a magnet inside a coil

Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Everything is relevant to your course
Edexcel - Separate/triple science and higher tier only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science and higher tier only

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