Question

The resistance $R=\frac{V}{I}$ where $V=(100\pm 5)V$ and $I=(10\pm 0.2)A.$ The percentage error in R is

• A. 5.2%
• B. 4.8%
• C. 7%
• D. 3%

Answer 1

Answer: (C)

$R=\frac{v}{I}$
$\frac{\Delta R}{R}\times 100=\frac{\Delta V}{V}\times 100+\frac{\Delta I}{I}\times 100$
$=5\%+2\%=7\%$