Найти общий сопротивление и мощность 4 лампы . Если R1=2омR2=1омR3=5омR4=1 омI = 2 А. Created by sergeysargsyanotl7bg. fizika-ru

Найти общий сопротивление и мощность 4 лампы . Если R1=2омR2=1омR3=5омR4=1 омI =...

fatt52

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R12=R1+R2=2+1=3 Ом
R34=R3+R4=5+1=6 Ом
Ro=R12*R34/(R12+R34)=3*6/(3+6)=2 Ом
Uo=I*Ro=2*2=4 B
I4=Uo/R34=4/6=0.67 A
P4=I4²*R4=0.67²*1=0.44 Вт
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ilyusha2145

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R1=R1+R2=2 Om+1 Om=3 Om
R2=R3+R4=5 Om+1 Om=6 Om
R=R1*R2/R1+R2=18 Om/9 Om=2 Om.
U=IR=4V
I=U/R=4v/6 Om=0,67A
P=UI=I^2*R=0,4489*1 Om=0,4489Вт.

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