Re: [Phys-l] transformer question

[Brian Whatcott <betwys1@sbcglobal.net>]

Mangala Joshua wrote:
> The transformer equation in undergraduate texts is 
>
> Vp/Vs=Np/Ns 
>
> However if we set up an experiment we observe that 
>
> Vp/Vs depends on the frequency of the primary source( or Vs changes with frequency) 
>
> What is the cause of this frequency dependence? 
>
> Mangala Joshua 
Losses increase with frequency, not least of which is hysteresis
loss of the magnetic circuit. Designers wanting higher frequency
performance begin with thinner core stampings, select  high-silicon
steel for  lower eddy current loss, proceed to wire-wound core
toroids,then use iron dust and ferrite cores, finishing with
air-cores.

Brian W