A mass of 15 kg of air in a piston-cylinder device is heated from 25 to 77 degrees Celsius by passing current through a resistance heater inside the cylinder. The pressure inside the cylinder is held constant at 300 kPa during the process, and a heat loss of 1.0 kJ occurs. Determine the electric energy supplied, in kWh.
Answer: 0.235 kWh.
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This solution contains step-by-step calculations to determine electric energy supplied using the heat used in heating the air, constant pressure, and heat lost. All equations and workings are shown.