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A loudspeaker produces sound by converting electrical signals from an audio amplifier into mechanical motion. Sound is created from the forward and backward motion of the loudspeaker cone, which is a concave plastic or paper disc. The cone is mounted and centred on a concave metal frame by a ring of flexible rubber. Glued to the centre of the cone is a hollow cylinder of thin, lightweight aluminium. A length of thin, insulated wire is wound upon the bobbin to form the voice coil; both ends of the voice coil wire are connected to the voice coil terminals on the frame. The voice coil is positioned inside a narrow cylindrical groove or air gap in the centre of a magnet. The coil is suspended in the air gap by a flexible fabric disc. An audio amplifier is connected to the voice coil terminals. The coil emits a magnetic field as audio signals from the amplifier travel through the voice coil wire. The voice coil field alternately pulls and pushes the coil, bobbin and cone assembly towards and against the magnetic field from the magnet, which causes the forward and backward cone motion.
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What happens when a permanent magnet moving coil instrument be connected in an ac current?
The torque on the moving coil will reverse at twice the frequency of the supply, causing the pointer to vibrate. High-quality a.c. measuring instruments that incorporate a moving coil are, of course, common but incorporate a rectification circuit to supply the coil.
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
Specifically what are moving coil and moving iron used for measuring?
If you are questioning about different relay (contactor) constructions, the terms moving coil and moving iron designate what part of the relay moves and carries the conductor that makes or breaks a circuit.
Is it possible to use a moving coil loudspeaker instead of a moving coil microphone?
Yes, but the sensitivity and frequency response will be very poor. The diaphragm on a microphone, corresponding to the voice coil and cone on a speaker, is extraordinarily light and compliant.
What is pmmc?
pmmc stands for permanent magnet moving coil instruments these instruments are secondary measuring instruments in these instruments a permanent magnet is installed and a moving coil in this way when current is passed through the fixed coil then a force will be developed on the moving coil and thus it moves and with this moving pointer moves on the scale and gives the corresponding reading . if someone wants to read it thoroughly then he can try ashfaq hussain , j.b.gupta of basic elelctrical engg. for b.tech first year .
What will happen in the absence of iron cylinder in a moving coil galvanometer?
it will not work
What is the work of actuator in fan coil unit?
In a fan coil unit, the actuator plays a crucial role in controlling the flow of water through the coil. It regulates the valve that opens or closes to manage the temperature and airflow based on the system's demands. By adjusting the valve position, the actuator ensures that the unit operates efficiently, providing the desired heating or cooling effect in the space it serves. This precise control contributes to overall energy efficiency and comfort within the environment.
What is the construction and working details of moving iron and moving coil ammeters and moving coil voltmeters?
Different b/w a moving coil instrument and a moving iron instrument
How does a field coil speaker work?
A: A speaker has a magnet and the wire is suspended in a zone by a cone whereby +/- current will make the coil move up or down moving the coil and moving the cone causing air displacement as waves of pressure that our ears can detect as sounds in our brains.
What are the types of galvanometer?
The two main types of galvanometers are moving coil galvanometers and moving magnet galvanometers. Moving coil galvanometers use a coil of wire that moves in a magnetic field, while moving magnet galvanometers use a magnet that moves in a coil of wire.
What is moving coil voltmeter?
mic or moving iron coil is instrument type works on ac and dc
What two types of technologies are used to move the actuator arm?
stepper motor, voice coil
How can electricity be produced using a magnet and wire coil?
Electricity can be produced by moving a magnet through a wire coil, which induces a current in the coil. This process is known as electromagnetic induction and is the basis for how generators work to produce electricity. The moving magnetic field created by the magnet interacting with the wire coil creates an electric current to flow in the wire.
What is moving coil type voltmeters?
mic or moving iron coil is instrument type works on ac and dc
Is megger related to hot wire instrument moving coil or moving iron?
Megger is related to a hot wire instrument with a moving coil. The megger uses a moving coil to measure insulation resistance in electrical circuits and equipment. This type of instrument is specifically designed for insulation testing.
Actuator motors will not work on your 1999 mercury villager?
Not enough information. Which actuator motors are you talking about, and what about them?
Can a moving coil loud speaker be used as a moving coil microphone?
Yes, but with vey low sensitivity and poor frequency response.
