An insulated piston-cylinder device contains 5 L of saturated
liquid water at a constant pressure of 150 kPa. Water is
stirred by a paddle wheel while a current of 8 A flows for
45 min through a resistor placed in the water. If one-half of the
liquid is evaporated during this constant-pressure process
and the paddle-wheel work amounts to 300 kJ, determine the
voltage of the source. Also, show the process on a P-υ diagram
with respect to saturation lines.