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A1: For ac(let fre. of 50 hz) changes its direction 100 times a second...(50 times -ive and 50 times +ive) giving no significant movement
A2: What is meant by this question? What moving coil are you referring to? Many AC motors have two coils of wire, and one definitely moves.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agothey are secondary coil. it means low resistance
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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.
Working principle of induction type instrument?
it works on the principle of induction i.e. on the production of eddy currents in the moving system by the alternating fluxes
Why moving iron is used in both AC and DC current?
A moving iron instrument works by means of a coil that attracts a moving iron mass that is attached to a pivoted pointer which moves across a graduated scale. The iron mass will be attracted towards the coil, regardless of the magnetic polarity of the coil. So, as an AC current continually reverses the magnetic polarity of the coil, the iron mass is always attracted towards the coil, never repelled by it. Similarly, a moving iron instrument doesn't care in which direction a DC current is flowing. So the instrument works equally well with both AC and DC currents. Moving iron instruments, however, are not as accurate as moving coil instruments which, of course, are sensitive to the direction of current.
What is the Operating Principles of Moving Coil Instrument?
The basic principle of moving iron instruments is it works on the principal of magnetic repulsion.... it consists of two irons one stationary n other fixed to a moving pointer small current flows through a coil surrounding the irons.this creates a magnetic field ,which magnetise the two irons.. the magnetise iron will develop a repulsion force between each other, this will cause the pointer to move against the spring the pointer stop moving when the spring tension equals the repulsion force between the magnets...
Does steel seal really works on blown head gasket?
As an emergency repair yes. The only permanent repair is to replace the gasket.
What is a moving coil instrument?
It works on DC only It consist a permanent magnet coil.
What types of magnet either permanent or electromagnetic for AC or DC relay?
What types of magnet either permanent or electromagnetic for AC and DC relay?"how DPDT relay works?
What is a movable coil?
mic or moving iron coil is instrument type works on ac and dc
What is moving coil voltmeter?
mic or moving iron coil is instrument type works on ac and dc
When a piece of iron behaves like a magnet when it is touching a permanent magnet that is called?
The process by which a iron piece touching a permanent magnet behaves as a magnet as long as it maintains contact is called magnetic induction. not only does this work when the iron is physically touching the magnet but it works as long as the piece of iron remains under the influence of the magnet. A iron piece attracted to a magnet through a paper with out any physical contact will also behave as a magnet.
What is moving coil type voltmeters?
mic or moving iron coil is instrument type works on ac and dc
How a loudspeaker works?
A loud speaker (like other speakers) produce sound (which is actually vibrations in the air heard by the ear) with a permanent magnet and a temporary magnet in wire form that is wrapped around the permanent magnet. (or a magnet that can be turned on and off by electricity) the speaker translates the sound into a series of electrical currents and then produces the electricity to alter the temporary magnet and making the magnets vibrate and in turn vibrates the air.
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.
How are magnets used in fridge door works?
They basically work just like any other permanent magnet. The magnet, and the magnetic material (iron-based) in the refrigerator, attract one another.
How does the magnet works on cold and hot temperature and what important idea.?
the magnet that works better is the cold magnet
What is PMDC motors?
PMDC-Permanent Magnet DC motor is a DC machine where the Permanent Magnets form the stator of the machine instead of conventional Field winding. It works on the same principle of electromagnetic induction.
How does an electromagnetic differ from a permanent magnet?
An electromagnet is only magnetic while electricity is being passed through it. When the electricity is turned off, it no longer works.
