Question

In each cycle of a Carnot engine, 116 J of
heat is absorbed from the high-temperature
reservoir and 51 J is exhausted to the low temperature reservoir.
What is the efficiency of the engine?

Answer 1

The efficiency of the engine is defined to be:

where
W is the work done by the system (energy exiting the system as work),
Q_H is the heat put into the system (heat energy entering the system),
Q_C is the heat exhausted to the low-temperature reservoir.