## a. P=\frac{(\Delta V)^{2}}{4 R}b. \begin{array}{l}{\text { Both bulbs receive the same current and dissipate the same power, and are }} \\ {\text { the same brightness. }} \\ {I=\frac{\Delta V}{K}} \\ {P=\frac{(\Delta V)^{2}}{R}}\end{array}c. \text { Case } 2 \text { is brighter. }d. \begin{array}{l}{\text { In case } 1, \text { if one bulb goes out, so will the other. In case } 2, \text { if one bulb goes out, the }} \\ {\text { other will remain at the same brightness. }}\end{array}

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