- We are surrounded by different kinds of sounds all the time. For example: the sounds produced by musical instruments, humming of birds, or a wailing child.
- Speaker is a vital electronic component which produces sound. It is an electromechanical device which converts electrical energy into sound.
- Speaker is a non-polarised component.
- Sound refers to waves of frequencies that a human ear can hear. Human ear can hear sound between frequency range 20 hertz to 20 kilohertz.
- Sound is produced by some form of mechanical vibrations.
- When the vibrations are slow, we hear low frequency deep sounds (near 20 hertz). These low frequency sounds are called Bass.
- When the vibrations are high, we hear high pitched high frequency sounds (near 20 kilohertz). This high frequency sound is called treble.
How does a speaker produce sound?
A speaker consists of four components – voice coil, paper cone, magnet and metal chasis.
When a varying electric current flows through the voice coil of a speaker, it becomes electromagnet. This electromagnet is attracted and repelled by the permanent magnet of the speaker. As the coil moves, the paper cone of the speaker moves back and forth thus releasing sound waves into the air.