4. R=ρL/S
R=2,8*10^-8*0,02/0,2=0,28*10^8 (Ом)
I=U/R
I=40/0,28*10^8=142*10^-8 (A)
5. A=IUt
A=0,25*4*600=600 (Дж)
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4. R=ρL/S
R=2,8*10^-8*0,02/0,2=0,28*10^8 (Ом)
I=U/R
I=40/0,28*10^8=142*10^-8 (A)
5. A=IUt
A=0,25*4*600=600 (Дж)