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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
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