You are viewing a free preview of this lesson.
Subscribe to unlock all 10 lessons in this course and every other course on LearningBro.
This lesson covers Higher Tier content. Questions on generators, alternators, dynamos, loudspeakers and microphones may appear only on Higher Tier papers in the Edexcel GCSE Combined Science specification (1SC0).
This lesson builds on electromagnetic induction to explain how AC generators (alternators), DC generators (dynamos), loudspeakers and microphones work.
An AC generator (alternator) converts kinetic energy into electrical energy by rotating a coil in a magnetic field.
| Component | Role |
|---|---|
| Rectangular coil | Rotates in the magnetic field; a voltage is induced in it |
| Permanent magnets | Provide the external magnetic field |
| Slip rings | Two complete rings attached to the coil; rotate with it |
| Brushes | Stationary contacts that press against the slip rings and connect to the external circuit |
Subscribe to continue reading
Get full access to this lesson and all 10 lessons in this course.