3.7v x 3.7v / 1.5 ohms = 9.12 watts (4.56 watts per coil)
9.12 watts / 3.7v = 2.466 amps
With a single coil 3.0 ohm carto/atty:
3.7v x 3.7v / 3 ohms = 4.56 watts (4.56 watts per coil)
4.56 watts / 3.7 volts = 1.23 amps
For a "warmer" vape:
3.7v x 3.7v / 2 ohms = 6.85 watts at the coil
6.85 watts / 3.7 volts = 1.85 amps. Warmer vape than with the 1.5ohm dual coil, much lower amp draw.
*****
"Friends don't let friends use dual coils"
[Unless they have a very specific reason, of course]
I did all that math before. Kinda a point i have made time and time again. 1.5 to 1.6 is pushing the amp limit. Also check your cartos with a meter to see what they actually measure.
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