Physics - Error Question with Solution | TestHub

Potential difference is $V=100\pm 5\mathrm{V}$ Current is $I=10\pm 0.2\mathrm{A}$. Percentage error in voltage is obtained as $\frac{\Delta V}{V}=\frac{5}{100}\times 100\%=5\%$ Percentage error in current is obtained as $\frac{\Delta I}{I}=\frac{0.2}{10}\times 100\%=2\%$ Using, $R=\frac{V}{I}$, the percentage error in resistance is calculated as $R=5\%+2\%=7\%$.