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h=6m
ρ=1000 kg/m³
g=10 N/kg
p=?
p=g*h*ρ
p=10*6*1000 [N/kg*m*kg/m³=N/m²=Pa]
p=60 000Pa= 60KPa
2.
R1=3Ω
R2=3Ω
Rz=?
Rz=1/R1+1/R2
Rz=1/3+1/3
Rz=2/3=3/2
Rz=1,5 Ω
3.
I=3A
U=27V
R=?
R=U/I
R=27/3 [V/A =Ω]
R=9Ω