Valjuhääldi
Valjuhääldi, also known as a loudspeaker or speaker, is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. This is achieved through the principle of electromagnetism. Typically, a loudspeaker consists of a diaphragm, a voice coil, and a magnetic structure. When an alternating current, representing the audio signal, passes through the voice coil, it generates a fluctuating magnetic field. This field interacts with the stationary magnetic field of the permanent magnet, causing the voice coil and the attached diaphragm to vibrate back and forth. These vibrations displace the surrounding air, creating sound waves that travel to the listener's ear.
The size and shape of the diaphragm, the strength of the magnet, and the design of the