Headphones
device · 1910 · Electric age
Miniature loudspeakers at the ears.
Inventor: Ernest Mercadier.
What it is made of
- Permanent magnet — has part. A magnet moves the diaphragm.
- Loudspeaker — has part. Miniature drivers.
- Headband — has part. A band that presses the cups.
- Headphone ear cushions — has part. Soft pads.
- Copper wire — has part. A cable.
Principles and materials it uses
- Active noise cancelling — uses. Noise-cancelling headphones.
- Copper — is made of. The coils are copper.
- Sound wave — uses. The diaphragm creates a sound wave.
Where it is used
- Walkman — is part of. Headphones.
- MP3 player — is part of. Headphones.
- Audiometer — is part of. Headphones.
History: what it evolved from and what it influenced
- Wireless earbuds — evolved into. Wireless headphones.
What it is a kind of
- Loudspeaker — is a kind of. A miniature loudspeaker.