Working principle of electric loudspeaker

When the speaker is working, we see that the vibration of the diaphragm is in the upper and lower vibration, which makes the vibration of the diaphragm is the electric power, the interaction between the current carrying conductor and the magnetic field, the size of which is:F=BLI

F – Instantaneous value of electric power N（Newton）

B – Gap magnetic flux density T（Tesla）

L – Voice coil length M（M）

I – Instantaneous current intensity A（Ampere）

Voice coil in a magnetic field force, determined according to the law of Fleming's left hand, left hand thumb and other four refers to the vertical, so that the magnetic field lines through the palm of the hand, four finger pointing in the direction of the current flow, is the thumb in the direction of both for the voice coil by the direction of the force, if changing the current direction, the direction of F changed. The voice coil in the electric power of the role of the upper and lower motion, driven by the paper basin of vibration, the speed of the vibration of the paper is related to the input frequency, the magnitude of the vibration of the power of the input current. When the paper is vibrating, the surrounding air is raised, which constitutes a sound wave, which is introduced into the ear. The conversion of the electric - to - to - force - > sound is accomplished by the speaker.