Question 26

Total current$=\frac{V}{R_{total}}=\frac{V}{R_{1}+R_{2}}$
$V_{1}=IR_{1}=\frac{VR_{1}}{R_{1}+R_{2}}$
$P_{1}=\frac{V_{1}^{2}}{R_{1}}=\frac{V^{2}R_{1}}{(R_{1}+R_{2})^{2}}$