S=100см2=0,01м2
F=50Н
p=F/S=50Н/0,01м2=5000Па
P=0.028 Ом*мм^2/мl=150см=1.5мS=0.1мм^2I=0.5АR=Pl/S=0.028*1.5м/0.1=0.42 ОмU=I*R=0.42 Ом*0.5A=0.21В