a. \(R=R1+R2=R3=5+10+15=30\Omega\)
b. \(I=I1=I2=I3=U:R=12:30=0,4A\left(R1ntR2ntR3\right)\)
\(\Rightarrow\left\{{}\begin{matrix}U1=I1.R1=0,4.5=2V\\U2=I2.R2=0,4.10=4V\\U3=I3.R3=0,4.15=6V\end{matrix}\right.\)
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