Hello!
We can use Ohm's Law to solve for the potential difference across a resistor given the current and resistance:
[tex]V = iR[/tex]
V = Potential Difference (? V)
i = Current (1.5 A)
R = Resistance (12 Ω)
Plug in the known values and solve.
[tex]V = (1.5)(12) = \boxed{18 V}[/tex]