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DC motor

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  • What are the main parts of a DC motor?
    Armature, Magnetic poles and Commutator
  • What is the energy conversion in electric DC motor?
    Electric energy --> Mechanical energy
  • What are the two main parts of the commutator?
    Split rings and the brushes.
  • Differentiate between permanent magnets and electromagnets.
    Electromagnets need electricity to activate its magnetism but permanent magnets have their magnetism naturally for a long period of time.
  • What are the two rules used to find the direction of current flow?
    Maxwell's corkscrew rule and right hand grip rule.
  • Give at least one dependent factor of force.
    The magnitude of current through the conductor. The length of the conductor between the rods. The strength of the magnetic field.
  • What is used as the motor in toy motor cars, hybrid cars, electric cars and electric trains?
    DC motor
  • Explain how the DC motor works with the aid of the given diagram.
    ..........
  • What can be found using Fleming' left hand rule?
    Direction of force.
  • What is magnetic field?
    The region where the magnetism exists around a magnet.
  • Explain how the loud speakers works by completing the following answer, with the help of the diagram given.
    The coil is connected to an electricity supply. The coil is placed between two permanent magnets.............
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