That would require a 101 lesson in electrics and i am not the right person to tell you. However, a easy explanation might get you on the right track. The lower the resistance(ohm), the more vape you get and you get a bigger throat hit.
ok bud here's the short version you have your coil at say 2.0 ohms and 3.7volts comin out of your battery so 6.85watts going to the coil pulling 1.85amps outta the battery - if you are using a dual coil tank with 2x 2ohm coils ur total resistance is 1 ohm any thing else you need to know check out http://vapecalc.com/ http://batteryuniversity.com/
there's also a handy fella on here who knows pretty much everything about batteries and their workings - Tubbyengineer