Question

what is the resistance of a 20.4 −m-long piece of 12-gauge copper wire having a 2.047 −mm diameter? the resistivity of copper is 1.61 ×10−8ωm.

Answer 1

Answer: 3.24 * 10^-4 ohms

Step-by-step explanation:

For this question, we will use the equation R = p L/A. R represents resisatnce, p is resistivity, L is length, and A is area.

p = 1.61 * 10^-8 ohm-meters

L = 20.4 m

A = (area of a circle)

- Convert diameter into radius (and the correct units): 2.047/2 * 10 ^-3.

Now plug them into the equation.