A power cable $X$ has resistance $R$ and carries current $I$. A second cable $Y$ has resistance $2R$ and carries current $\frac{1}{2}I$. What is the ratio $\dfrac{\text{power dissipated in }Y}{\text{power dissipated in }X}$?
- A$\frac{1}{4}$
- B$\frac{1}{2}$
- C$2$
- D$4$