Discussion
A wall of 100 m\( ^2 \) and U-value 2.0 W/m\( ^2 \)K with 15 \( ^\circ \)C across it conducts
Answer: D
Correct answer: 3000 W
\[ Q = UA\Delta T = 2.0 \times 100 \times 15 = 3000\ \mathrm{W}. \] The same wall insulated to the 1.75 resistance of the previous item would conduct 857 W instead, which is the whole case for insulation expressed in one comparison.
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