1)R=R1+R2=7Oм+3Ом=10Ом
I=U/R=10B/10Oм=1А
2)R=R1*R2/R1+R2=30*70/30+70=21Oм
U=IR=21Ом*2,1А=44,1В
3)R=R1+R2=20Oм+37Ом=57Ом
I=U/R=4В/57Ом=0,07А
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1)R=R1+R2=7Oм+3Ом=10Ом
I=U/R=10B/10Oм=1А
2)R=R1*R2/R1+R2=30*70/30+70=21Oм
U=IR=21Ом*2,1А=44,1В
3)R=R1+R2=20Oм+37Ом=57Ом
I=U/R=4В/57Ом=0,07А