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U=230V
k=0,6-zł/kWh
R=?
K=?
P=U*I I=U/R stąd P=U²/R
R=U²/P=230²/2,7=19593Ω
W=P*T=2,7W*365*24h=23652Wh=23,652kWh
K=k*W=0,60*23,652=14,19zł