alleryPower consumed P = V²/R. If V measured to 2% and R to 1%, find error in P:
A2%
B5% (= 2 × 2% + 1%)
C3%
D1%
Answer & Solution
Correct answer: B. 5% (= 2 × 2% + 1%)
We have ΔP/P = 2(ΔV/V) + (ΔR/R).
That is ΔP/P = 2 × 2% + 1%.
So ΔP/P = 5%.
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