I=U/(R1+R2)=30/(5+10)=2 A (общий ток в цепи)
U2=I*R2=2*10=20 B
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I=U/(R1+R2)=30/(5+10)=2 A (общий ток в цепи)
U2=I*R2=2*10=20 B
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I= U/R = 30/15 = 2 A
U2 = I * R2 = 2 * 10 = 20 V