W=E
Praca = Energia pobrana
W=P*t
P=60W
P'=2kW=2000W
t=5h=300min=18000s
t'=15min=900s
W=60W*18000s=1080000J=1080kJ
W'=2000W*900s=1800000J=1800kJ
1080kJ<1800kJ
Czajnik pobiera więcej energii.
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W=E
Praca = Energia pobrana
W=P*t
P=60W
P'=2kW=2000W
t=5h=300min=18000s
t'=15min=900s
W=60W*18000s=1080000J=1080kJ
W'=2000W*900s=1800000J=1800kJ
1080kJ<1800kJ
Czajnik pobiera więcej energii.