Summary

• Laws of thermodynamics
• First law of thermodynamics
• Thermodynamic processes

• Reading Quiz




• 2^nd Law of Thermodynamics
• Heat engines
  • diagram and applet
  • work and P-V diagram
  • Stirling engine animation
  • Otto cycle applet
  • actual efficiency
  • second law of thermodynamics
    Example #1
    
    Example #2
    
  • examples
  • Stirling engine demo
  
  
  
  
  
  
  
  
  
  
  

Walker4e
Reading quiz What is the efficiency of a heat engine?
A. The ratio of the fuel energy input over exhaust energy output.
B. The rate at which a heat engine completes a thermal cycle.
C. The ratio of exhaust energy output over work input.
D. The ratio of work output over fuel energy input.
Answer















sj6 22.2
A heat engine performs 200 J of work/cycle and is 30% efficient. How much energy is absorbed per cycle?
A. 200 J
B. 467 J
C. 667 J
D. 60 J
Answer















sj6 22.2
A heat engine performs 200 J of work/cycle and is 30% efficient. How much energy is expelled per cycle?
A. 200 J
B. 467 J
C. 667 J
D. 60 J
Answer















 



D. The ratio of work output over fuel energy input.

Efficiency can be broadly defined as the desired result the production of mechanical energy, or work) divided by what it costs you (fuel energy input).
























 



C. 667 J





















 



B. 467 J