The principle of the generator is of course electromagnetic induction... Magnetism generates electricity. It's a popular saying... that can't be written...
Microphones, microphones, cassette recordings, etc. , all input sounds are electric. Magnetic induction
Speakers, tape playback and other sound playback are all current magnetic effects
You can only understand the principle by clearly distinguishing the signal conversion
Microphones are The conversion of sound signals into electrical signals consists of transforming electricity (generating a specific current), it is therefore an electromagnetic induction
Equipment such as speakers convert existing electricity into vibrations (through changes in magnetic fields), produce vibrations, produce sound), it is electricity that generates magnetism, so it is the magnetic effect actuel
(2013? Baiyun District Model) The picture is a schematic diagram of the structure of a dynamic microphone (microphone) and a loudspeaker (loudspeaker)． When a person speaks into a microphone,
| (1) sound volume (2) electromagnetic induction; |
| Analysis of test questions: (1) The three elements of sound are : pitch and loudness and timbre refer to the size of the sound. (2) The working principle of dynamic microphone is: the application of electromagnetic induction phenomenon. (3) The energized coil is subjected to a force in the magnetic field. The direction of the force is related to the direction of the current and the direction of the magnetic field lines. If the current or the direction of the magnetic field lines becomes opposite, the current is supplied. The direction of the force on the wire also becomes opposite. (1) The sound becomes louder after passing through the amplifier, so its main purpose is to change the volume of the sound (2) The sound vibrates the diaphragm and causes; the coil to vibrate. The movement of cutting magnetic field lines in a magnetic field produces an induced current. This is the phenomenon of electromagnetic induction. (3) When the coil is energized, the energized coil will be subject to the action of a force in the magnetic field, and the direction of the force is related to the direction of the current. Therefore, when the direction of current changes, the direction of force on the coil becomes opposite and the coil moves to the right, similarly to the speaker principle, the motor is also based on the principle according to which it is powered on; the coil is forced to rotate in the magnetic field, and the principle of the generator is electromagnetic induction. Comment: The high-parleur is a device that converts electrical signals into acoustic signals. Its principle is that the energized coil moves under the influence of a force in the magnetic field, which causes the paper cone to vibrate and produce sound. The principle of a loudspeaker is the same as that of an electric motor, and the principle of a dynamic microphone is the same as that of a generator. |
What is the principle of a dynamic microphone?
(1) The sound is louder after passing through the amplifier , so its main The purpose is to change the intensity of the sound;
(2) The sound vibrates the diaphragm, causing the coil to move cutting the magnetic field lines in the magnetic field, generating an induced current. This is the phenomenon of electromagnetic induction.
(3) When the coil is energized, the energized coil will be subjected to a force in the magnetic field, and the direction of the force is relatedto the direction of the current. Therefore, when the direction of current changes, the direction of force on the coil becomes opposite and the coil moves to the right, similarly to the speaker principle, the motor is also based on the principle according to which it is powered on; the coil is forced to rotate in the magnetic field, and the principle of the generator is electromagnetic induction.
So the answer is: (1) volume; (2) electromagnetic induction; (3) it is true;
Question 1: The working principle of dynamic microphone is achieved by using the electromagnetic response phenomenon.
When sound waves vibrate the metal diaphragm, the coil (called the voice coil) connected to the diaphragm vibrates together, and the voice coil vibrates in the magnetic field of the magnet permanent. An induced current (electrical signal) is generated. The magnitude and direction of the current changet induced are determined by the sound waves. This signal current is amplified by the amplifier and then transmitted to the speaker. an amplified sound is output from the speaker.
Question 2: Are the principles of moving coil microphones and headphones the same? The microphone changes and the current generates a magnetic field. The earphone changes the magnetic field and generates an electric current. Because sound vibrates the diaphragm, the magnetic material of the earphone is uneven. Changes in the magnetic field generate current.
Question 3: The principle of the moving coil. microphone Moving coil microphone (moving coil microphone) Technical acoustics moving coil microphone, moving coil microphone) is a device that converts sound into electrical signals. Dynamic microphones are manufactured using the phenomenon of electromagnetic induction. When sound waves vibrate a diaphragmmetal, a coil (called a voice coil) connected to the diaphragm vibrates together, and the voice coil vibrates in the magnetic field of a permanent magnet. An induced current (electrical signal) is generated. The magnitude and direction of the induced current change is determined by the sound wave. This signal current is amplified by the amplifier and then transmitted to the speaker. amplified sound is output from the speaker.
Question 4: The working principle of the dynamic microphone in the picture is the same (Analysis C: Since the working principle of the dynamic microphone is electromagnetic induction, only energy production in C The principle of the machine is the same, so choose C
Question 5: What are the principles of dynamic microphones and speakers of generators and motors
Question 6: The principle of operation of dynamic microphones is the same as that of deviceselectrical. The structure of dynamic microphones is the same as that of dynamic headphones. The principle of operation is reverse! that sound waves push the diaphragm! The coil on the membrane core vibrates in the strong magnetic space! The latter is the coil generating an alternating magnetic field through the audio current. It interacts with the permanent magnet to make the vibrating membrane emit sound waves! !