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t=10min=10*60=600s
R=20om
I=0,2A
R=U/I
U=RI
Ek=W
W=UIt
W=RIIt
W=I^2Rt
W=0,2^2*20*600
W=480J
W=[A^2*om*s^2=A^2*(1V/1A) *s =A*V*s=J]