Wow cartos run at 2.3 ohms on average and range from 2.0-2.8 ohms Ms. KimberlyM. Understanding ohms, volts, amps, and watts not only can enhance your experience by helping you find your sweet spot, also keeps you safe and lets you know why you're unable to run certain items on other items (like the 1.5 ohm dual coils on a pt).