From: fizzbintuesday@that-google-mail-domain.com   
      
   Jeroen Belleman wrote:   
   > On 2021-08-27 08:07, Tom Del Rosso wrote:   
   >> Jeroen Belleman wrote:   
   >>> On 2021-08-26 04:25, Tom Del Rosso wrote:   
   >>>> Jeroen Belleman wrote:   
   >>>>> Tom Del Rosso wrote:   
   >>>>>> AIUI you use iron cores for low frequency and ferrite for high   
   >>>>>> frequency because ferrite doesn't get magnetized, so why couldn't   
   >>>>>> aluminum do the same?   
   >>>>>   
   >>>>> You *want* a transformer core to be easily magnetized! You don't   
   >>>>> want it to *stay* magnetized when the current goes to zero.   
   >>>>   
   >>>> Of course that's what I meant. It has to conduct a magnetic field   
   >>>> but it must not fight the induced field when it reverses.   
   >>>>   
   >>>> I asked about the behavior of ferrite vs aluminum.   
   >>>>   
   >>>>   
   >>>   
   >>> The short answer is that aluminium is worse than nothing as a   
   >>> transformer core. It *will* fight changing fields.   
   >>   
   >> That implies that it will "stay magnetized" as you put it, so the   
   >> answer is too short but thanks for trying.   
   >>   
   >>   
   >   
   > Aluminium is a good conductor. There will be eddy currents induced   
   > in it that will oppose any /change/ of magnetic field. Lenz law and   
   > all that.But once external fields are removed and enough time has   
   > passed for eddy currents to decay, there will be no field left over.   
      
   I know what you mean, but since the current only has the length of the   
   core to travel it's hard to grasp how that produces more than a very   
   short pulse.   
      
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