De quoi est fait telephone
Transmitting the voice over wires.
- Microphone — a pour partie. The handset microphone turns the voice into an electrical signal.
- Loudspeaker — a pour partie. The earpiece reproduces the other person’s voice.
- Rotary dial — a pour partie. A dial.
- Microphone à charbon — a pour partie. For a century, telephone microphones were carbon microphones.
- Telephone exchange — utilise. Connecting subscribers.
- Cuivre — est fait de. The wires and coils are copper.
- Bakélite — est fait de. The body of classic telephones is Bakelite.