If you have a well built microcoil where each wrap is touching, aren't you essentially creating a short circuit? My question is what makes the electrical current flow through the leg, and each wrap of the coil all the way through to the end? Wouldn't the current be able to flow through one leg, into the first wrap, and then travel across the top of the entire coil because all of the kanthal is touching?
Question about electrical current in a microcoil
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When heated, Kanthal wire (iron-chromium-aluminium) produces an aluminum oxide (Al2O3) insulative coating on it's outside surface that protects the individual coils from shorting, one to another. Aluminum oxide, also referred to as alumina, has high thermal conductivity and electrical resistivity.
For a given length and thickness of wire, the resistance does not change any appreciable amount, whether it's a 7 wrap conventional coil or a 7 wrap compressed coil.
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