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U=230V
R=80Ω
W=?
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W=U*I*t
I=U/R stąd W=U²*t/R
W=230²*1800/80=1190250 [V²*s/(V/A=V*A*s=J]=1,19MJ
1190250J=1190250Ws=330Wh=0,33kWh