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In a heat engine, what is the work done equal to?

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

Options:

  1. Heat input minus heat output
  2. Heat output minus heat input
  3. Total heat energy
  4. Change in internal energy

Correct Answer: Heat input minus heat output

Solution: 

The work done by a heat engine is equal to the heat input minus the heat output.

In a heat engine, what is the work done equal to?

Practice Questions

Q1
In a heat engine, what is the work done equal to?
  1. Heat input minus heat output
  2. Heat output minus heat input
  3. Total heat energy
  4. Change in internal energy

Questions & Step-by-Step Solutions

In a heat engine, what is the work done equal to?
  • Step 1: Understand that a heat engine takes in heat energy from a hot source.
  • Step 2: Recognize that some of this heat energy is used to do work.
  • Step 3: Know that not all heat energy is converted to work; some is released to a cold source.
  • Step 4: The work done by the engine is calculated by taking the total heat energy input and subtracting the heat energy output.
  • Step 5: The formula can be written as: Work Done = Heat Input - Heat Output.
  • 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 heat transfer and work done.
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