Loudspeakers

• What is the motor effect?

  A force experienced by a current-carrying conductor in a magnetic field
• What is a key component of a moving coil loudspeaker?

  A cone with a coil of wire wrapped around one end
• What connects the coil of wire in a loudspeaker to the power source?

  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 from the coil and the permanent magnet interact?

  They either attract or repel each other
• What does the interaction of the magnetic fields produce?

  A resultant force causing the cone to move
• What happens when the cone switches direction?

  The direction of the force on the cone reverses
• How are sound waves generated in a loudspeaker?

  By the cone moving in and out
• How does changing the frequency of the AC supply affect sound?

  It changes the frequency that the cone vibrates
• What is the relationship between frequency and pitch of sound?

  Higher frequency produces higher pitch sound
• What happens when the size of the current is increased?

  The amplitude of the vibration increases
• What is the effect of increasing the amplitude of vibration?

  It increases the volume of the sound
• What is the role of the permanent magnet in a loudspeaker?

  It interacts with the coil's magnetic field
• How does the coil's magnetic field affect sound production?

  It interacts with the permanent magnet's field
• What is the significance of the cone in headphones?

  It converts electrical energy into sound waves