These kind of questions scare me because i am waiting for my provari to arrive and I feel that I will not be able to use it.
Just remember this formula:
Watts = Voltage X Voltage divided by the resistance.
The resistance will be in ohms, the carto or atty is rated in ohms.
The voltage is obviously the voltage you choose on the Provari
Most people like somewhere between 6 and 10 Watts.
Use a basic voltage, like 4, and the resistance of one of your cartos (in ohms).
Plug it into the formula. So, if you have a 2ohm carto.
4 volts x 4 volts = 16 volts. 16 volts /2 ohms = 8 watts.
8 watts is a good number. Start from there (4 volts) and adjust up or down according to taste.
If you use a 3ohm carto, you'll need to increase that 4 volts to get the same 8 watts.
If you use a 1.5ohm carto, you'll need to decrease the volts to get the same 8 watts.
Use one of the resistance values to plug into the formula and use different voltage values and you will see what effect it has on the watts produced. More watts = a warmer vapor. Too may watts = a burned taste.
If you go overboard and try too much voltage for a particular ohm value, the Provari will shut down and display an error message. Lower the voltage or raise the ohms (different carto)