What you'll learn
Magnetism and its link to electricity.
Key ideas
- Magnetic poles and fields; electromagnets.
- The motor effect; inducing a voltage; transformers and the National Grid.
Exam tips
- Draw field lines north to south.
- Explain why high-voltage transmission reduces losses.
Common mistakes
- Reversing field-line direction.
- Confusing step-up and step-down transformers.