dynamo

Noun
  1. Generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature (synset 103265207)
    is a type of: generator - engine that converts mechanical energy into electrical energy by electromagnetic induction
    has: field magnet - a magnet that provides a magnetic field in a dynamo or electric motor

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