Jaka jest sprawność silnika o mocy 6,5 kW, jeżeli w ciągu 20min wykonuje on pracę 0.48 Mj?
sprawność: η = Puz/Pc Puz = W/t
W = 0.48 MJ = 480 000 J t = 20 min = 1200 s Pc = 6.5 kW = 6500 W
η = W/(t*Pc) = 480000/(1200*6500) = 0.0615 = 6.15% (nędzny ten silnik)
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sprawność: η = Puz/Pc Puz = W/t
W = 0.48 MJ = 480 000 J t = 20 min = 1200 s Pc = 6.5 kW = 6500 W
η = W/(t*Pc) = 480000/(1200*6500) = 0.0615 = 6.15% (nędzny ten silnik)