loudspeakers and headphones

    Cards (17)

    • What should you be able to describe by the end of this video?
      How a moving coil loudspeaker works
    • What is the motor effect?
      A force experienced by a current-carrying conductor in a magnetic field
    • In which devices is the motor effect used as discussed in the video?
      Loudspeakers and headphones
    • What is a key component of a moving coil loudspeaker?
      A cone with a coil of wire
    • How is the coil of wire connected in a loudspeaker?
      To an alternating current electrical supply
    • What happens when current passes through the coil of wire?
      It generates a magnetic field
    • How do the magnetic fields interact in a loudspeaker?
      They either attract or repel each other
    • What does the resultant force on the cone cause?
      The cone to move in and out
    • What happens when the direction of the current switches?
      The direction of the force on the cone reverses
    • How can the frequency of the sound produced be changed?
      By changing the frequency of the AC supply
    • What does a higher frequency produce in terms of sound?
      A higher pitch sound
    • What effect does increasing the size of the current have?
      Increases the amplitude of the vibration
    • What does an increased amplitude of vibration do to the sound?
      Increases the volume of the sound
    • Where can you find more questions on moving coil loudspeakers?
      In the revision workbook
    • Who is the intended audience for this video?
      Higher-tier students
    • What is the role of the cone in a loudspeaker?
      To generate sound waves
    • Why is the interaction of magnetic fields important in loudspeakers?
      It produces the force that moves the cone
    See similar decks