Microphones (AQA GCSE Physics): Revision Notes
📚 Revision Notes
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.
infoNote
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.