Microphones Simplified Revision Notes for GCSE AQA Physics

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7.3.4 Microphones How Dynamic Microphones Work (Physics only) Sound to Current Conversion : Dynamic microphones convert sound waves into an electrical current that is proportional to the sound signal. Components : A fixed magnet is positioned at the centre. info Note Operation : Sound waves create pressure variations that cause the coil to move back and forth around the magnet. As the coil moves through the magnetic field, a current is induced in the coil due to the generator effect . The induced current, which varies with the sound wave, is then transmitted to a loudspeaker or recording device.

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