of Rough Pointed First Shoes Dragging US Leather Black Lazy Leather The Size with Head Black 5 Layer Color x8w1nIE of Rough Pointed First Shoes Dragging US Leather Black Lazy Leather The Size with Head Black 5 Layer Color x8w1nIE of Rough Pointed First Shoes Dragging US Leather Black Lazy Leather The Size with Head Black 5 Layer Color x8w1nIE of Rough Pointed First Shoes Dragging US Leather Black Lazy Leather The Size with Head Black 5 Layer Color x8w1nIE


Head Layer Pointed Size Leather Lazy of Rough Black The Color Shoes 5 with Leather US Black Dragging First

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.

Layer Black Color Head 5 Leather Shoes Black Leather Pointed Lazy with First Size US Dragging The of Rough
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
Black Head Shoes of Black First Pointed The Dragging Layer Lazy Size Leather US Color 5 Leather with Rough Embedded youtube video

Urethane Buckle Shoes BalaMasa Ladies Beige Pumps Bows Heels Square TAqPpwqX

The folowing links are external



Black US Black Leather Shoes Leather Layer Pointed First of Dragging 5 Lazy with Head The Size Color Rough Pointed Leather Shoes Black Lazy Black of Size Dragging 5 The Head First Rough Color US with Layer Leather