Step 1: Understand that a heat engine takes in heat from a hot source, called the hot reservoir.
Step 2: Know that the engine does work using some of this heat.
Step 3: Realize that not all the heat is used for work; some heat is released to a cooler area, called the cold reservoir.
Step 4: The work done by the engine is calculated by taking the total heat absorbed from the hot reservoir and subtracting the heat that is released to the cold reservoir.
Step 5: The formula can be written as: Work Done = Heat Absorbed - Heat Rejected.
