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Electromagnetic Speakers

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by

Keshav Reddy

on 15 November 2015

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Transcript of Electromagnetic Speakers

Materials
CD cover
Paper plate
Copper wire
Audio plug
2 small rectangular cardboard pieces
A small nut
A strong magnet
Solder
Method
How does it Work?
Inside a speaker, an electromagnet is placed in front of a permanent magnet. The permanent magnet is fixed firmly into position whereas the electromagnet is mobile. As pulses of electricity pass through the coil of the electromagnet, the direction of its magnetic field is rapidly changed. This means that it is in turn attracted to and repelled from the permanent magnet, vibrating back and forth.
Continued . . .
The electromagnet is attached to a cone made of a flexible material such as paper or plastic which amplifies these vibrations, pumping sound waves into the surrounding air and towards your ears.
Electromagnetic Speakers
From 0.59 seconds
Full transcript