dynamo
nounUK /ˈdaɪnəməʊ/
US /ˈdaɪnəmoʊ/
A dynamo is a machine that makes electricity by spinning.
The old bicycle had a small dynamo that lit the front lamp.
RELATED WORDS
OTHER MEANINGS
2. A very energetic and hardworking person.
She's a real dynamo who never seems to get tired.
3. A force or source of great energy and activity.
The new coach brought a dynamo of enthusiasm to the team.
4. A device that converts mechanical energy into electrical energy, especially a direct-current generator.
The factory used a large dynamo to power its machines.