First, the vibrations of sound are converted into electrical energy. This step is usually done by some sort of microphone. The vibrations are produced by sound waves, which create changes in air pressure that the microphone picks up and turns it into electrical voltage. That electricity is then sent to an amplifier, which multiplies the strength of the sound waves so that it can be heard on a larger scale through speakers. The speaker turns the electrical voltage back into a vibration so that the sound waves are received by our eardrums, allowing us to hear it.
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