A mass of 12 kg of saturated refrigerant-134a vapor is contained in a piston - cylinder device at 240 kPa. Now 300 kJ of heat is transferred to the refrigerant at constant pressure while a 110-V source supplies current to a resistor within the cylinder for 6 min. Determine the current supplied if the final temperature is 70oC. Also, show the process on a T-v diagram with respect to the saturation lines.

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R-134a P constant 0 FIGURE P4-115