Atomizer and cartomizers have a current resistance. There are positive and negative connections. The higher resistance means more voltage is required to attain the same heat as a low resistance with lower voltage. Your ego is 3.2volts. I've used an ego as a beginner PV. I needed more and warmer vapor than the NR (normal resistance) atties and cartos could provide. I switched to Boge LR 2.0ohm, then to dual coil cartos. The dual
coils read 1.6ohms, but that's because there are 2
coils running parallel which causes half the impedence or resistance.
Long story, short is that the lower resistance will provide warmer, fuller, more flavorful vapor. Do yourself a favor and pick up a 5pack of Dual
coils. They can be refilled many times before needing a cleaning or disposal.
Driptips are used for their larger openings to allow direct dripping onto an atty. I, however use a driptip on my cartos for ease of removal when I need to top-off the liquid in the carto filler.
I hope this helps clear your confusion.