Efficiency- Output/Input

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Presentation transcript:

Efficiency- Output/Input Furnace A 1 HP motor consumes 815 W of power

Sankey diagram:

A motor consumes 425 J of energy and does 300 J of work. e = ? Wi = 425 J, Wo = 300. J e = Wo/Wi = (300. J)/(425 J) = .706 = 70.6% .71 or 71 %

A person is 13% efficient. How much food energy to do 600. J of work? e = .13, Wi = ? J, Wo = 600. J e = Wo/Wi Wi = Wo/e = (600. J)/(.13) = 4615 = 4600 J 4600 J

A 60.% efficient heater uses 800. J of energy. What is its heat output? e = .60, Wi = 800. J, Wo = ? e = Wo/Wi Wo = eWi = (.60)(800. J) = 480 J 480 J

A car is 25% efficient. What energy input does it need to climb a 320 m tall hill if its mass is 1200 kg? e = .25, Wi = ? J, Wo = mgh = (1200 kg)(9.80 N/kg)(320 m) = 3763200 J e = Wo/Wi Wi = Wo/e = (3763200 J)/(.25) = 15052800 J = 1.5 x 107 J 1.5 x 107 J