noun
- a dielectric material that has a quasi-permanent electric charge or dipole polarization
Usage: physics; technical
Examples
- The microphone uses an electret to convert sound waves into electrical signals.
- Electret materials maintain their charge for many years without an external power source.
- The engineer selected a fluoropolymer electret for the acoustic sensor.
- Modern hearing aids often contain electret microphones due to their small size.
- The electret’s permanent polarization makes it useful in various electronic devices.