#### Question

A house is maintained at $21^{\circ} \mathrm{C}$ in winter by electric resistance heaters. If the outdoor temperature is $3^{\circ} \mathrm{C},$ the second-law efficiency of the resistance heaters is (a) 0% (b) 4.1% (c) 6.1% (d) 8.6% (e) 16.3%

#### Solution

Verified#### Step 1

1 of 2The second-law efficiency simply is:

$\begin{align*} \eta_{\text{II}}&=1-\dfrac{T_{0}}{T_{H}}\\ &=1-\dfrac{276}{294}\\ &=\boxed{0.061} \end{align*}$

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