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Loudspeakers- Physics
3
Transcript
Loudspeakers
A loudspeaker is a permanent magnet surrounding an electromagnet connected to a cone.
- When an electrical current passes through a wire coil in a magnetic field, it produces a force which varies with the current applied
- Called an "magneto electric apparatus", it was invented in 1874 by Ernst W. Siemens. In 1923, Bell Labratories wanted to create a full musical playback phonograph with speakers and they did. This became our speakers today.
- Loudspeakers use electro-mechano-acoustic transduction. They convert electrical energy into mechanical energy which in turn is converted into acoustic/sound energy.
Sources:
- http://www.school-for-champions.com/science/electromagnetic_devices.htm#.UzQ1-fm-3Tp
- http://www.aes.org/aeshc/docs/recording.technology.history/loudspeaker.html
- http://www.acoustics.salford.ac.uk/acoustics_info/loudspeakers/?content=index
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