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η=40%
Wu=360kJ
P=0,8kW
t=?
η=Pu*100%/P
Pu=η*P/100%=40%*0,8kW/100%=0,32kW
Wu=Pu*t
t=Wu/Pu=360kJ/0,32kW=1125s=18min45s
2.dane
P=2kW
η=60%
t=2h
Wu=?
η=Pu*100%/P
Pu=η*P/100%=60%*2kW/100%=1,2kW
Wu=Pu*t=1,2kW*7200s=8640kJ=8,64MJ