loudspeakers and headphones

    Cards (7)

    • What should you be able to describe by the end of the video on moving coil loudspeakers and headphones?

      How a moving coil loudspeaker and headphones work
    • What is the motor effect?

      It is the force experienced by a conductor carrying a current in a magnetic field
    • In which devices is the motor effect used as discussed in the video?

      Loudspeakers and headphones
    • How does a moving coil loudspeaker work?

      • A cone has a coil of wire wrapped around one end.
      • The coil is connected to an alternating current (AC) electrical supply.
      • A permanent magnet is placed inside the coil.
      • The current generates a magnetic field in the coil.
      • The coil's magnetic field interacts with the permanent magnet's field, causing movement.
      • The cone moves in and out, generating sound waves.
    • What happens to the cone when the direction of the current changes?

      The direction of the force on the cone reverses, causing it to move in and out
    • How does changing the frequency of the AC supply affect the sound produced?

      A higher frequency produces a higher pitch sound, while a lower frequency produces a lower pitch sound
    • What effect does increasing the size of the current have on the sound produced?
      It increases the amplitude of the vibration, which increases the volume of the sound
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