work done Efficiency energy put into the system Qhat-Q Efficiency )×100% For an ideal engine, the ratio of two energy terms is identical to the ratio of two temperature terms Carnot cold cold /I hot where the temperatures are given on the absolute(Kelvin scale Efficiency 7)×100% cold It is remarkable that this efficiency( Carnot) depends only on the temperatures of the two reservoirs between which the heat engine operatesEfficiency = work done energy put into the system Efficiency = Qhot - Qcold Qhot = (1 - ) x 100% Qcold Qhot For an ideal engine, the ratio of two energy terms is identical to the ratio of two temperature terms: Qcold / Qhot = Tcold / Thot where the temperatures are given on the absolute (Kelvin) scale. Tcold Efficiency = (1 - ) x 100% Thot It is remarkable that this efficiency (Carnot) depends only on the temperatures of the two reservoirs between which the heat engine operates. Carnot