Question

Un conductor ohmic din cupru are sectiunea S=0.35 si rezistenta R=5 ohmi.
Ce lungime are conductorul ?
ro=1. 75 · $10^{-8}$ ohmi· m

Answer 1

R=ro*L/S
L=R*S/ro=5*0,35*0,000001/(1,75*0,00000001)=5*0,35*100/1,75= 100 metri