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Eddy currents are currents induced in conductors to oppose the change in flux that generated them. It is caused when a conductor is exposed to a changing magnetic field due to relative motion of the field source and conductor, or due to variations of the field with time. This can cause a circulating flow of electrons, or a current, within the body of the conductor. These circulating eddies of current create induced magnetic fields that oppose the change of the original magnetic field due to Lenz's law, causing repulsive or drag forces between the conductor and the magnet. The stronger the applied magnetic field, or the greater the electrical conductivity of the conductor, or the faster the field that the conductor is exposed to changes, then the greater the currents that are developed and the greater the opposing field.
What else can I help you with?
Is that possible to save the loss current from step down transformer?
If by 'loss current' (?) you mean the 'copper losses', then there is no practical way of doing so without reducing the load current. Perhaps you should explain what you understand 'loss current', in the context of a step-down transformer, to mean?
Does a laminated iron core increase eddy current losses?
No, the purpose of laminating the core is to reduceeddy-current losses.
How do you calculate copper losses?
copper losses are power losses due to flow of current in the wires or resistances,if the resistance is R, current is I then copper losses are I2R. for a 3-phase system; copper losses are same but for a single line, total losses are 3I2R.
What are the different kinds of losses in machines?
stray losses,armature copper losses,iron losses(Hysteresis and eddy current losses),mechanical losses(friction and windage losses)
What are the benefits of transmitting electricity by AC rather than DC?
Transformers that allow changing of current levels. Losses are proportional to I^2R current losses. Decreasing current decreases losses. There are other benefits depending on uses and safety, its all about Engineering.
Why may copper losses be neglected in the open circuit test of a transformer?
Because the magnetising current is very small, so the primary losses are insignificant, while there is no secondary current, so there are no secondary losses.
Core loss of an induction motor?
Just like a transformer, the core losses are a combination of eddy current losses and hysteresis losses.
What does power loss in electrical transmission mean?
The term, 'power loss', describes the rate of energy losses caused by the load current in the transmission lines
Why we can't store alternating current?
Not quite sure what you mean; a current, by definition, is a flow of electric charges. You can convert electrical energy to some other type of energy, and store the ENERGY, which can then be converted back later (there will always be some losses, of course), but it isn't clear what you mean by "store electrical current".
Why don't we use one piece for transformer core?
If, by 'one piece', you mean solid -as opposed to laminated- then the answer is that a solid core will have significantly-higher eddy current (circulating current) losses than a solid core.
Why open circuit test show only core losses?
With the secondary not supplying any load, there is no secondary current and the primary current will be a low-value magnetising current. So, the copper losses, (I2R) will be insignificant.
How is eddy current related to the thickness of the stampings of core?
A: Eddy currents are current losses if an iron bolt is used to hold the core lamination together that alone will cause losses. Usually a brass bolt is used to eliminate losses
