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t=2min=120s
q=4000C
W=?
------------------------------------------------
q=I*t
I=q/t=4000C/120s=33,3A
W=U*I*t
z prawa Ohma U=I*R stąd W=I²*R*t
W=33,3²*800*120=106453440 [A²*Ω*s=A²*V/A*s=V*A*s=J]
106453440J=106,5MJ