Wire wizard - current per volt value

[Izet]

Hello,

I started to build my coils with steam engine application, I have found information about heat flux per watt, heat capacity and it helped me to build coils that suite me perfectly. the only thing that still gives headaches is current per volt value. I would be very grateful if someone ciuld explain how to use it.


Kind Regards
Izet

 

[mimöschen]

That value is almost useless in actual use. More so if you use only regulated devices.
You may have a slight benefit from it, if you're a mech user, but even then you have simpler methods available.
In theory the lower the coil's resistance the more amps have to be pumped through it. Each of our 18650s have a varying voltage from 4.2-3V depending on charge state and a fixed maximum CDR - the maximum amps you can draw - which can vary from 2-30A depending on the specific model you use.
So a 20A CDR cell like the Samsung 25R can safely put out

20A x 4,2V = 84W max on a mech ignoring battery sag and voltage drop.

You don't have an ampreader on a mech however, so you need the cells voltage and the coil's resistance to calculate amps drawn.

Voltage/Amps = Ohm

So your coil resistance must not be below 0.21ohm to stay within the 25R's safety rating of 20A.
Amps per volt just turns the equation around to

Amps/Volts = 1/Ohm