23P1Q06

6 B

Input Power

$\displaystyle \begin{aligned} & =\frac{1}{2}(9.7)({{4.0}^{2}}-{{1.5}^{2}}) \\ & =77.6-10.9125 \\ & =66.6975\text{ W} \end{aligned}$

Power output

$\displaystyle \begin{aligned} & =60\%\times 66.6975 \\ & =40\text{ W} \\\end{aligned}$

Option B corresponds to power output of $\displaystyle P=VI=12\times 3.3=40\text{ W}$

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