How do the volume controls on a TV work? Is it through some kind of amplitude modification?
Thanks in advance for your answers.
In: Technology
A speaker works by vibrating the air in front of it. These vibrations in the air make sound waves. If you vibrate the air at a certain frequency, it’ll make a certain sound. The bigger the vibrations are, the louder the sound will be.
Electric speakers use a permanent magnet and a coil of wire. When you run current through wires, it creates a magnetic field. This magnetic field attracts the permanent magnet. By varying the voltage in the wires, you vary the magnetic field, and that makes the permanent magnet move back and forth – hence, your vibrations.
In a speaker circuit you use a rheostat to control how much voltage goes into the coil. More voltage means a stronger magnetic field, and a stronger magnetic field means bigger vibrations, bigger vibrations means louder sound.
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