Force Suede 1 Mens Sneakers Force Suede 1 Mens Sneakers Force Suede 1 Mens Sneakers Force Suede 1 Mens Sneakers Force Suede 1 Mens Sneakers


"Olympics" Low Max Rio photo Blue Suede Air Force Sneakers 1 NRG Nike White Air Mens Athletic

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.

Rio "Olympics" photo Suede Nike Low Air Force Air Max Mens White NRG 1 Athletic Blue Sneakers
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
Nike Sneakers Rio Force Max Blue Suede "Olympics" Air White Mens NRG photo Air Athletic Low 1 Embedded youtube video

Slip Merrell Thermo 9 On Women's Moc Endersy WTPF qXrFXwUP

The folowing links are external



Nike Suede Force "Olympics" Max Athletic Mens Low Sneakers Blue 1 Rio White Air NRG Air photo Air 1 Air Blue Nike Max "Olympics" Athletic Force Mens Rio NRG Sneakers photo Suede Low White