A current of I=8.0A is flowing in a typical extension cord of length L=3.00m. The cord is made of copper wire with diameter d=1.5mm.
The charge of the electron is e=1.6*10^-19C. The resisitivity of copper is [tex]\rho[/tex]=1.7*10^-8[tex]\Omega[/tex] m. The concentration of free electrons in copper is n=8.5*10^28m^-3
I honestly have no idea. There's nothing in my book about collisions at all other than saying that's what causes resistance.
The Attempt at a Solution
Honestly have no idea where to begin... there is literally not a thing about this in my book. It's from an online homework assignment.