If a coil gets burnt, does its resistance necessarily increase? The reason I'm asking this is that I have a vape, and burnt coils are common in vaping. The vape has an LCD that shows the resistance of the coil in real-time. So my question has two parts:

A. Same resistance as before --> not burnt?

B. Burnt --> increased resistance?

  • 1
    \$\begingroup\$ use an ohm meter and find out for yourself \$\endgroup\$
    – jsotola
    May 18 '18 at 7:00

It could go either way.

If the cross section of the coil decreases, due to chemical combination of the surface metal into non-conducting oxides, then the resistance will increase. This will be permanent.

If adjacent turns of the coil touch, then the resistance will decrease. This may be permanent, but could be reversed if the coil moves again and they stop touching.

An LCD to monitor 'techy' stuff about the vape sounds a bit excessive, but I guess you've got to distinguish it from the competition somehow.

  • \$\begingroup\$ Thanks. What about burning due to overheating? Is it a case of the first scenario? \$\endgroup\$
    – Asmani
    May 18 '18 at 8:15

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