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I1=0,6A
U2=1,5V
R=?
I2=?
-------------------------------------------------
I1=U1/R
R=U1/I1=4,5V/0,6A=7,5Ω
I2=U2/R=1,5V/7,5Ω=0,2A
odp.
R=7,5Ω; I2=0,2A