Question

Relate the output of energy from a heat engine to the energy put into the heat engine considering the second law of thermodynamics.

You're answer would be greatly appreciated.

Answer 1

Answer:

Considering the II law of thermodynamics

From the figure

Out put of energy:

Heat supplied from the source/ reservoir  (Q₁) - Heat rejected to the surroundings from the system (Q) = Q₁ - Q₂. Also known as Net work done on the system.

Input of energy:

Amount of heat energy supplied to the system from the source (Q₁ ).

Efficiency (H.E) = η = Output÷ Input

                             η  = (Q₁ - Q₂) ÷ Q₁

                      OR η = Wnet ÷ Q₁ ;        since Wnet = (Q₁ - Q₂)