Accuracy and correctness
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Using the passive sign convention (current enters the positive terminal): $$ P = v_dep \times i_dep = 22.22 \times 0.555 \approx 12.34, \textW $$
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Electric Circuits: Nilsson, James, Reidel, Susan - Amazon.com
Find a common denominator (40): $$ \frac4v_140 + \frac0.5v_140 = 5 $$ $$ \frac4.5v_140 = 5 $$