The speaker is composed of an electromagnet, a coil, and a horn diaphragm. The speaker converts the frequency of the current into sound. The principle of physics, when an electric field is generated by a current through a coil, the direction of the magnetic field is the right-hand rule. Assume that the speaker plays the C tone, its frequency is 256Hz, that is, 256 vibrations per second, the speaker outputs 256Hz AC power, the current changes 256 times per second, and the C tone frequency is issued. When the electric coil vibrates with the speaker film, the surrounding air is vibrated, and the speaker generates sound.
The frequency of sound waves that the human ear can hear is generally between 20 Hz and 20,000 Hz, so ordinary speakers will set the program in this range. The working principle is the same as above. The process of energy conversion is from electrical energy to magnetic energy, from magnetic energy to mechanical energy, and then from mechanical energy to sound.
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