Question

What is the resistance of a 25.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter?

Answer 1

Explanations & Calculations

• Just use the formula for resistance and plug the given values to get the answer.
• If we took the resistivity; $\small \rho = 1.72\times10^{-8}\,\Omega\,m$ at 20 celsius then the resistance can be calculated,

$\qquad\qquad \begin{aligned} \small R&=\small \rho.\frac{L}{Area}\\ \end{aligned}$