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Why tesla coil is air-cored to operate efficiently at high freq?



Original poster: d a <btoc3000@xxxxxxxxxxxx>


Hi all,



I have three theoretical questions here:


I read this from a website: "A normal transformer users an iron core in order to operate at low frequencies, whereas the Tesla Coil is air-cored to operate efficiently at much higher frequencies".




I understand that a normal transformer relies on turn ratios and the air core is there to reinforce the magnetic flux.



May I then ask, why is an iron core only required in low frequency operation and why do we use an air-core for high frequency operation?


Lastly, I read this from another website: " In the Tesla "swing", the kick is supplied by the AC electrical current moving back and forth". Can someone elaborate on this please? Is it actually referring to the LC circuit - both the secondary and primary operating at the same frequency that reinforce each other?




Thank you very much for your kind attention.


Regards Sam