P = U x I U = I x R P = I x I x R R = l / S x (ro - opór właściwy ) R = 1 x 1,6 / pi = 1,6 / pi P = 11,7 x 1,6 / pi = 18,71 / pi
Dane: I=3,42A l=1m s=2cm=0,02m rho=1,7 · 10^-8 Oblicz: P=? Rozwiązanie: [latex]r=pi r^{2}[/latex] [latex]r=3,14*0,02^{2}[/latex] [latex]r=3,14*0,0004[/latex] [latex]r=0,001256m^{2}[/latex] [latex]P=I^{2}*R[/latex] [latex]P=I^{2}*( hofrac{l}{s})[/latex] [latex]P=3,42^{2}*(1,7*10^{-8}frac{1}{0,001256})[/latex] [latex]P=3,42^{2}*1353,503*10^{-8}[/latex] [latex]P=11,6964*1353,503*10^{-8}[/latex] [latex]P=15831,1124892*10^{-8}[/latex] [latex]P approx 0,0001583W[/latex]
