transformers

Transformers have three main losses, core, winding and magnemotive between primary and secondary windings .

Core loss : the heavier (more material) in the core the more magnetism required to saturate the core. Whenever you put a coil of wire around a steel core you magnetize and heat the core , thi basically is the core losses.....

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Hello "Guest"

That is the loss incurred in magnetising/demagnetising/magnetising in the opposite polarity, as the applied frequency changes through one cycle of the Alternating Current (AC) Waveform.

The AC is normally either at 50 Hz for England sourced electrical equipment, 60 Hz for US sourced electrical equipment, or often 400Hz for airplane equipment.

As the applied AC frequency increases, the Core Loss increases, because of the reluctance of the magnetic domains in the core material to change strength and polarity.

At Radio frequencies the cores have to be "ferrites", and as the applied frequency increases further, even 'ferrites' have too great a Core loss, and then the transformers and coils become air-cored.

At frequencies above 2GHz, the transformer or inductor is not easily recognized as such, and often looks more like common metal plumbing pipework, placed near each other, but these are still transformers or inductors, although they are air-cored to minimise Core loss.

Read more about Core Loss here: http://en.wikipedia.org/wiki/Core_loss

Kind Regards....