Pearson Edexcel International GCSE in Physics · 4PH1
Topic 6 · Magnetism and electromagnetism
Magnetic fields and how a current makes one, the motor effect and the left-hand rule, electromagnetic induction, generators and transformers.
6 lessons, covering 20 specification statements: 6.1 · 6.2 · 6.3 · 6.4 · 6.5 · 6.6 · 6.7 · 6.8 · 6.9 · 6.10 · 6.11 · 6.12 · 6.13 · 6.14 · 6.15 · 6.16 · 6.17 · 6.18 · 6.19 · 6.20
The lessons
- Magnets and Magnetic Fields — Why only repulsion proves you are holding a magnet, and what a field line is actually a picture of. (6.1, 6.2, 6.3, 6.4)
- Induced Magnetism and Field Patterns — Why an iron nail sticks to a magnet at all, why it never pushes back, and how to plot a field you cannot see. (6.5, 6.6, 6.7)
- Electromagnets — The four pages of Latin that showed a current makes a field — and why that field goes round the wire rather than along it. (6.8, 6.9, 6.10)
- The Motor Effect — Put a current in a magnetic field and something moves — the effect behind every electric motor and every loudspeaker. (6.11, 6.12, 6.13, 6.14)
- Electromagnetic Induction — Move a magnet near a coil and a voltage appears from nowhere — provided something is changing. (6.15, 6.16)
- Transformers — Two coils that never touch, the reason the National Grid runs at 400 000 volts, and why none of it works on a battery. (6.17, 6.18, 6.19, 6.20)