how does a speaker works?

Question

I would appreciate if someone can help me, i have to know all the structure and how does a speaker works, using the components, etc, if you know please help me!! or if you know a site where i can found something!! thanks!!

Answer 1

A loudspeaker is a basic "motor-generator" (which your science teacher should have introduced you to at school.)

It consists of a coil of wire suspended in a magnetic field. The coil is attached to a "cone" or diaphragm.

If a current is passed through the coil it produces a magnetic field around the coil. That magnetic field interacts with the field in which the coil is suspended and causes the cone to move.

Used like this, the coil/magnetic field combination is exploiting the motor effect.


If, instead of passing a current through the coil, someone speaks closely to the cone the consequent movement of the coil within the magnetic field causes a current to flow in it. If this current is passed to an amplifier the speaker's voice may be heard if the amplified signal is connected to either a loudspeaker or earphone/s.

Used like this the coil/magnetic field combination is exploiting the generator effect.

The effects are interdependent. You can't have one without the other.

Another name for a loudpeaker or microphone is a transducer. A fancy name for something which converts one form of energy to another.