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Odp. C
303.
P=UI=20V*0,5A=10W
R=U/I=20V/0,5A=40W
304.
I=P/U
I1=2000W/230V=8,7A
I2=1200W/230V=5,23A
I3=1500W/230V=6,52A
8,7+5,23+6,52=20,45A