AC Generator (Alternator):
- Coil rotates in magnetic field
- Uses slip rings — output is AC
- Voltage alternates as coil rotates (sine wave)
- Used in power stations
DC Generator (Dynamo):
- Same as AC generator but uses split-ring commutator
- Commutator reverses connection every half turn
- Output is DC (always same direction, though bumpy)
- Used in bicycle dynamos
This key facts covers Generators & Alternators within Electromagnetic Induction for GCSE Physics. Revise Electromagnetic Induction in Magnetism for GCSE Physics with 18 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 3 of 9 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Electromagnetic Induction
What is electromagnetic induction?
Explain how a potential difference (voltage) is induced in a conductor in a magnetic field.
Quick recall flashcards
How to induce voltage?
Change magnetic field through conductor
AC generator output type?
Alternating current (sinusoidal)