What you'll learn
Generating electricity and transformers.
Key ideas
- Moving a magnet in a coil induces a voltage; generators.
- Transformers change a.c. voltage; the National Grid uses high voltage to reduce losses.
Exam tips
- Explain why high-voltage transmission reduces losses.
- Transformers work only with a.c.
Common mistakes
- Confusing step-up and step-down transformers.
- Thinking induction works with a stationary magnet.