what is meant by eddy current.is there any condition for its production?

Answer 1

It depends on the context. Eddy current is usually referring to the parasitic current produced in the iron core of a transformer or other inductor by the magnetic field. It wastes power.

Answer 2

In a transformer, there are two or more windings around a metal core ( Magnet core, usually steel ), the transformer can be a isolation, step up, or down.
The steel core helps to concentrate the magnetic field, increasing, the efficiency. this can also be considered a winding even though it is a single turn, connected together.
Since the iron core is a short circuit, one turn, and it's made of a conductive material (Steel), the magnetic field acts on it inducing a current, the Voltage will be extremely low, but there is sufficient current. This current will continuously circulate around and around the metal core, since iron is more resistive than copper, this current (eddy current) will produce heat.
If you closely, you will notice the core is made up of multiple layers of steel, this is used to reduce the effect of eddy current, within the core.

This condition will always be present when an AC current is used, on any transformer with a metal core.

Answer 3

a) Eddy current:
They r currents in close paths induced in a solid conductor when the magnetic flux intercepting it changes

b) The changing in magnetic flux can produced by:
1- Moving the solid in a magnetic field
2- Subjecting the metallic solid to the alternating magnetic field of an AC current

c) The direction of these currents r perpindicular to the direction
of the field

d) The factors affecting them:
1- The rate of change in magnetic flux cutting across the conductor
2- The resistivity of the material

e) To overcome them:
1- Choose a metal of a high resistivity (Silicon or Soft Iron)
2- The metallic solid is shaped in the form of thin sheets whose planes e parallel to the field & insulted from each other so eddy currents can't flow

f) The damage caused by them:
1- It produces heat which melts the insulating materials of the wires of the coil
2- It causes a great loss in electric energy (part is lost in producing them & the other part is lost as heat energy)

g) Importance of them:
they r used in Induction Furnace (for melting metals)

if u need more information, Google or Yahoo search will help u
i hope u got ur point from my explanation

Answer 4

An eddy is like a flow of power, a bit like the tide when your talking about the sea. There can be several conditions for its production but without knowing what you are specifically referring to i can't say what they are.

Answer 5

eddy currents r produced in any metal object due to varing magnetic fields .they move in circles,and increase the temp of the object this technology is used to melt metals in inversion furneces