Party Out Size US High Women Evening 4 Strappy Back FSJ Sandals Zipper Blue Shoes Cut Prom 15 Heel Classy x0P1gqTw6 Party Out Size US High Women Evening 4 Strappy Back FSJ Sandals Zipper Blue Shoes Cut Prom 15 Heel Classy x0P1gqTw6 Party Out Size US High Women Evening 4 Strappy Back FSJ Sandals Zipper Blue Shoes Cut Prom 15 Heel Classy x0P1gqTw6 Party Out Size US High Women Evening 4 Strappy Back FSJ Sandals Zipper Blue Shoes Cut Prom 15 Heel Classy x0P1gqTw6 Party Out Size US High Women Evening 4 Strappy Back FSJ Sandals Zipper Blue Shoes Cut Prom 15 Heel Classy x0P1gqTw6


Women US Prom Size Classy High 4 Evening Out FSJ Cut Heel 15 Strappy Zipper Party Back Blue Sandals Shoes

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.

Strappy Party Size Zipper Classy Back Sandals Prom Blue Cut 4 Women Out High Heel 15 Evening FSJ Shoes US
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
Out Heel High Strappy US Sandals Cut Shoes Prom Size Classy Blue Party Women Evening Back 15 4 Zipper FSJ Embedded youtube video

Comfort Business Shoes Shoes HUAN Work Formal Color Lace 41 Size up Spring Summer Men's Black Wedding Casual Brown Black Microfiber for nXqqwZx0

The folowing links are external



Heel Zipper Women Out Classy Blue Size Party Cut 15 Prom High Back Shoes US FSJ Sandals 4 Strappy Evening High Heel FSJ 4 Shoes US Size Evening Out Sandals Strappy Zipper Cut Prom Women Blue Party Back 15 Classy