Efficiency:

$\overline{){\mathbf{\eta}}{\mathbf{=}}\frac{{\mathbf{W}}_{\mathbf{o}\mathbf{u}\mathbf{t}}}{{\mathbf{W}}_{\mathbf{i}\mathbf{n}}}}$

η_{A} = 400W/1000W = 0.4

η_{B} = 1000W/1000W = 1

Which of the remaining designs has the highest thermal efficiency?

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