n mole of a perfect gas undergoes a cyclic process
ABCA (see figure) consisting of the following processes.
A→B : Isothermal expansion at temperature
T, so that the volume is doubled from
V1 to
V2=2V1 and pressure changes from
p1 to
p2.
B→C: Isobaric compression at pressure
p2 to initial volume
V1.
C→A : Isochoric change leading to change of pressure from
p2 to
p1.
Total work done in the complete cycle
ABCA is
