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yaltis
@yaltis
July 2022
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Сделайте задачи 8,9
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MashaPutnaj
Verified answer
1) дано t1=12C t2=100C m=1,2 кг U=220В КПД=0,9 I- ?
КПД=Q/Qз=с*m*(t2-t1)/U*I*t
I=c*m*(t2-t1)/0,9*U*t=4200*1,2*88/220*600=4,2*1.2*88/22*6=3.36А
2) найдем общее сопротивление 1/R=1/(R1+R2)+1/(R3+R4)=1/15+1/10=5/30
R=6Ом
U=I*R=36В
I4=U/(R3+R4)=3,6A
P4=I4^2*R4=3,6^2*2=25,92Вт
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Answers & Comments
Verified answer
1) дано t1=12C t2=100C m=1,2 кг U=220В КПД=0,9 I- ?КПД=Q/Qз=с*m*(t2-t1)/U*I*t
I=c*m*(t2-t1)/0,9*U*t=4200*1,2*88/220*600=4,2*1.2*88/22*6=3.36А
2) найдем общее сопротивление 1/R=1/(R1+R2)+1/(R3+R4)=1/15+1/10=5/30
R=6Ом
U=I*R=36В
I4=U/(R3+R4)=3,6A
P4=I4^2*R4=3,6^2*2=25,92Вт