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udontai
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Homework Statement
a mass of 15kg of air in piston-cylinder assembly is heated from 25°C to 77°C by passing current through a resistance heater inside the cylinder. the pressure inside the cylinder held constant at 300kPa during the process and heat loss of 60kJ occurs. (Cv= 0.718 kJ/kgK)
i) find the electrical energy supplied in kJ and kWhr
Homework Equations
The Attempt at a Solution
W-60k = 15 (0.718)(52)
W= 620.04kJ
so to find the energy in kWhr, take 620.04 /3600? is it correct?