High AmoonyFashion Round Women's Black Boots Heels Low Closed Toe Top Solid qAAIarS High AmoonyFashion Round Women's Black Boots Heels Low Closed Toe Top Solid qAAIarS High AmoonyFashion Round Women's Black Boots Heels Low Closed Toe Top Solid qAAIarS

Toe Black Round High Solid Boots Low Women's AmoonyFashion Closed Heels Top

Speakers come in all shapes and sizes, enabling you to listen to music on your iPod, enjoy a film at the cinema or hear a friend’s voice over the phone.

In order to translate an electrical signal into an audible sound, speakers contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it. This coil behaves much like a normal (permanent) magnet, with one particularly handy property: reversing the direction of the current in the coil flips the poles of the magnet.

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.

High Solid Black Top Round Low Women's Heels Toe Closed Boots AmoonyFashion
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.

Inside a speaker:
1. Cone
2. Electromagnet (coil)
3. Permanent magnet


The frequency of the vibrations governs the pitch of the sound produced, and their amplitude affects the volume – turn your stereo up high enough and you might even be able to see the diaphragm covering the cone move.

To reproduce all the different frequencies of sound in a piece of music faithfully, top quality speakers typically use different sized cones dedicated to high, medium and low frequencies.

A microphone uses the same mechanism as a speaker in reverse to convert sound into an electrical signal. In fact, you can even use a pair of headphones as a microphone!

Find related websites on music with physics.org

See a demonstration of how a speaker responds to an electric current
Closed AmoonyFashion Black Low Women's Toe Solid High Heels Top Boots Round Embedded youtube video

MULINSEN Lace Men's Oxford LIYUAN Shoe Up Black Eq5Oxndw

The folowing links are external

Top High Heels Round Toe Low Solid Closed Women's Black AmoonyFashion Boots Solid Closed Low Women's Boots High AmoonyFashion Heels Black Top Toe Round