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P2=200W
U=230V
I1=?
I2=?
I3=?
P=?
R1=?
R2=?
Rz=?
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P=U*I
I=P/U
I1=P1/U=100W/230V=0,43A
I2=P2/U=200W/230V=0,87A
I=I1+I2=0,43A+0,87A=1,3A
P=U*I=230V*1,3A=300W
I=U/R
R=U/I
R1=U/I1=230V/0,43A=535Ω
R2=U/I2=230V/0,87A=264Ω
Rz=U/I=230V/1,3A=177Ω