Speaker is a common device used to accomplish each change: Electrical energy to sound energy.
A device that does this is a dynamo, which transforms mechanical energy into electrical energy. In the case of a loudspeaker, the electrical signals are transformed into sound signals after being processed. Loudspeakers thereby transform electrical energy into sound energy.
The motor, often known as the voice coil, is the component of the speaker that transforms electrical energy into mechanical energy. The motor causes a diaphragm to vibrate, which causes the air in its near vicinity to vibrate as well, creating a sound wave that follows the pattern of the original speech or music signal.
Vibrations that are passing through something produce sound energy. Sound waves may travel through solids, liquids, and gases. When a force, such as sound or pressure, causes an item or substance to vibrate, the outcome is sound energy. Waves of that energy pass through the material.
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