I'll try to explain this as best I can but if I am off then please feel free to correct me as I am still actively learning myself...
When you change the resistance of the carto, you are changing the actual power of the unit. The 2.0 ohm carto is going to give you warmer
vaping and slightly more smoke production thanks to its higher wattage, although it is worth noting that smoke production seems to be more dependent upon juice than anything else. If your Riva had one of the smaller batteries, it would probably not be a good idea to run the 2.0 ohm cart due to the increased draw, which can be harmful to smaller batteries and potentially hazardous to the user. Due to this increased draw, lower resistance cartos will decrease battery life; however, the type of PV and battery will determine how big of a decrease this is. Is the battery 3.7 volts on the Riva or 3.2 volts? If so, the 2.6 to 3 ohm cartos seem to be the standard values often called 'standard resistance' (SR). Carts that are below 2.0 are often called 'low resistance' (LR). Many people seem to prefer one over the other, and so actually trying them out is probably the best way to know first hand. At least to me, the same juices seem to have differences in flavor and other
vaping characteristics depending on the wattage I am
vaping at....and sometimes these differences are very pronounced.
To know the wattage, this formula may help..
Power = (Voltage * Voltage) / Resistance
http://www.e-cigarette-forum.com/fo...e-wanted-know-plus-bit-electronic-theory.html
