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sveta223
@sveta223
September 2021
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Помогите решить 2 и 5 задачи
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Македонский
2)
I=U/R
отсюда находим R=U/I=200/4=50 Ом
R=ρl/S
l=S*R/ρ
ρ(меди)=0.017 Ом*мм^2/м
S=π(d/2)^2=π(2/2)^2=π мм^2
l=π*50/0.017=9235 м
5)E=U/d
U=E*d
U=25*10^3*0.03=750 В
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Answers & Comments
I=U/R
отсюда находим R=U/I=200/4=50 Ом
R=ρl/S
l=S*R/ρ
ρ(меди)=0.017 Ом*мм^2/м
S=π(d/2)^2=π(2/2)^2=π мм^2
l=π*50/0.017=9235 м
5)E=U/d
U=E*d
U=25*10^3*0.03=750 В