Electromagnetic crane, motor, speaker, electromagnetic relay, telephone receiver and electric bell.
Generator, dynamic microphone
What is the principle of dynamic microphone
| (1) Sound volume; (2) Electromagnetic induction (3) Law; |
| 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 currentor the direction of the magnetic field lines becomes opposite, 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 makes the diaphragm vibrate 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 under tensionnot ; the coil is forced to rotate in the magnetic field, and the principle of the generator is electromagnetic induction. Comment: The loudspeaker 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. |
Question 1: The operating principle of the dynamic microphone It is achieved 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 generatede. The magnitude and direction of the induced current change is 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. Magnetic field Because sound vibrates the diaphragm, the magnetic material of the earphone is uneven. Changes in the magnetic field produce an electric current.
Question 3: The principle of the moving coil microphone A moving coil microphone (moving coil microphone, moving coil microphone acoustic engineering, moving coil microphone) is a device that converts sound into electrical signals. Dynamic microphones are made using the pphenomenon of electromagnetic induction. When sound waves vibrate a metal diaphragm, 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 engines
Question 6: LThe operating principle of dynamic microphones is the same as that of electrical devices. 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! !