Loudspeaker
part · 1925 · Electric age
Turns an electrical signal into sound: a coil in a magnetic field moves a diaphragm.
Inventors: Edward Washburn Kellogg, Chester Williams Rice.
What it is made of
- Diaphragm — has part. The cone diaphragm vibrates and makes sound.
- Permanent magnet — has part. A permanent magnet.
Principles and materials it uses
- Electromagnetism — uses. A coil carrying current in the field of a permanent magnet moves the diaphragm.
- Sound wave — uses. It creates sound waves.
- Paper — is made of. The cone is paper.
- Copper — is made of. The coil is copper.
Where it is used
- Telephone — is part of. The earpiece reproduces the other person’s voice.
- Smartphone — is part of. An earpiece speaker and a multimedia speaker.
- Transistor radio — is part of. A loudspeaker.
- Television set — is part of. Sound.
- Smart speaker — is part of. A loudspeaker.
- Hearing aid — is part of. A miniature loudspeaker.
- Portable speaker — is part of. A loudspeaker.
- Intercom — is part of. A loudspeaker.
- Public address system — is part of. Loudspeakers.
- Wireless earbuds — is part of. A speaker driver.
- Headphones — is part of. Miniature drivers.
- Mobile phone — is part of. A loudspeaker.
- Geiger counter — is part of. Clicks for every particle.
What it is a kind of
- Headphones — includes. A miniature loudspeaker.
- Subwoofer — includes. A loudspeaker.
Things built in a similar way
- Microphone — works like. A loudspeaker and a microphone are inverse transducers: sound ↔ electrical signal.
- Dynamic microphone — works like. A loudspeaker in reverse.