microphones

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P G

Cards (2)

  • microphones use the generator effect to convert the pressure variations in sound waves into variations in current in electrical circuits
  • how microphones work:
    • sound waves hit the diaphragm
    • this causes the diaphragm and coil of wire to move back and forth, through the magnetic field produced by the magnet
    • as it does so, a potential difference current is induced in the wire
    • this induced potential difference switches direction as the coil moves backwards and forwards through the magnetic field
    • the frequency and amplitude of sound waves will determine how much the diaphragm vibrates and therefore determine the frequency and amplitude of the current
    • the changing pattern of pd is passed through an amplifier and loud speaker