What are (a) the heat QH extracted from the hot reservoir and (b) the efficiency of a heat engine described by the pV diagram in the figure?
(a) the work done by the cycle is the area bounded by the process on the PV diagram.
The area of the triangle is 0.5*(400×10^-6 m^3)*(200×10^3 Pa) = 40 J
According to the first law, the net heat in the system is equal to the work (for one cycle). QH – 100 – 180 = 40
QH = 320J
(b) Efficiency is work output divided by energy input.
efficiency = 40/320 = 0.125 or 12.5%
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