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R1=100[Ω]
R2=200[Ω]
Rz=R1+R2=100+200
Rz=300[Ω]
I=U/R
I=12/300=0,04[A]
U₁=I×R1=0,04×100
U₁=4[V]
U₂=I×R2=0,04×200
U₂=8[V]
P₁=U₁×I=0,16[W]
P₂=U₂×I=0,32[W]