# Question #74ee1

The diameter of Copper wire is $0.040 \text{ in}$
Nearest AWG (American wire gauge, also known as the Brown & Sharpe wire gauge) is $18$ which has diameter of $0.0403 \text{ in}$
Area of cross-section $= \frac{\pi {d}^{2}}{4}$
$= \frac{\pi \times {0.0403}^{2}}{4} = 0.0013 {\text{ in}}^{2}$, rounded to four decimal places
Resistance of $100 \text{ ft length} = 0.63697 \Omega$
at temperature of ${68}^{\circ} \text{F" or 20^@"C}$. It is important to mention temperature as resistance changes with temperature.