ダイナモ

noun

dynamo; electric generator

Refers to a device that converts mechanical energy into electrical energy, especially a direct-current generator. Also used metaphorically for an energetic person.

• 自じ転てん車しゃのライトはダイナモで点つく。

  The bicycle light is powered by a dynamo.

• 彼かれはチームのダイナモだ。

  He is the dynamo of the team.