Microphones, speakers, telephone receivers and telephone microphones are all based on the principle of electromagnetic induction: sound vibrations cause changes in resistance, changes in current and changing magnetic fields, thus producing currents induced.
Motors: Energized coils are affected by the magnetic field. The Ampere force rotates and converts electrical energy into mechanical energy.
Generator: An energized coil rotates in a magnetic field and generates an induced current. fluent. The conversion of mechanical energy into electrical energy is a phenomenon of electromagnetic induction.
Movement What is the principle of a coil microphone?
| (1 ) Sound volume; (2) Electromagnetic induction; (3) Engine; |
| Analysis of test questions: (1) The three elements of sound are : the height andLoudness 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 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 isra subjected to the action of a force in the magnetic field, and the direction of the force is linked 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 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 working 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 generated. 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 dynamic microphones and headphones the same? They are different. The changing current from the microphone generates a magnetic field and the earpiece changes. The magnetic field generates an electric field in the microphone as the sound vibrates the diaphragm and the magnetic material of the earpiece changes tor produce an electric current
Question 3: The principle of dynamic microphone The dynamic microphone (dynamic microphone) (moving coil microphone, engineering moving coil acoustic 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 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 principle of operation of the dynamic microphone in the imageis the same (Analysis C: Since the working principle of the dynamic microphone is electromagnetic induction, only the power generation 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 working 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 the sound waves push the diaphragm! magnetic! The latter is the coil generating an alternating magnetic field through the audio current. It interacts with the permanent magnet to emit sound waves from the vibrating membrane!