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U=IR
W=I²Rt
I²=W/Rt
I=√W/Rt
I=5A
U=5A×10Ω
U=50V
R=10Ω
E=250J
t=1s
Szukane:
I=?
U=?
Rozw.
E=I²Rt
I=√W/Rt
I=√250J/10Ω=5A
R=U/I
U=RI
U=10Ω*5A=50V