Dress white Heel HooH High Women's Pointed Stiletto Toe Pumps 8cm heel 78w8Yaqp

Stiletto white Women's HooH heel Pumps Toe High Pointed 8cm Dress Heel

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.

white Pointed heel Pumps Women's Toe 8cm Dress HooH Stiletto High Heel
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
Dress heel Heel 8cm HooH white Women's Pointed Toe High Stiletto Pumps Embedded youtube video

9M BERTO Point 6 Fashion Suede Loafer Dress Plain BRAVO Round Toe a Shoes Men's Black with Faux 4wUtRBUqaO

The folowing links are external

8cm HooH Women's Toe High white Heel Pumps Stiletto Pointed Dress heel High Dress HooH white 8cm Heel Pumps Stiletto heel Pointed Toe Women's