In a heat engine, the work done is equal to:

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Question: In a heat engine, the work done is equal to:

Options:

Correct Answer: Heat absorbed minus heat rejected

Solution:

The work done by a heat engine is equal to the heat absorbed from the hot reservoir minus the heat rejected to the cold reservoir.

In a heat engine, the work done is equal to:

In a heat engine, the work done is equal to:

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.

First Law of Thermodynamics – The principle that energy cannot be created or destroyed, only transformed from one form to another.
Heat Engine Efficiency – The ratio of work output to heat input, highlighting the relationship between absorbed and rejected heat.
Heat Transfer – The process of heat moving from a hot reservoir to a cold reservoir, which is essential for the operation of a heat engine.