Question

can we use aluminium foil for the first primary coating of a mini tesla

Answer 1

There are two problems with aluminium wire:

It's not very strong, so winding high turn count coils can be tricky

It can be difficult to make good connections to, since it forms an insulating oxide layer when exposed to the air

If you can overcome these issues and persuade the wire to wind without breaking, I don't see why it wouldn't work. It is probably better suited to the primary coil than the secondary, since the primary has fewer turns using thicker wire.

Hope it helps you

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