Thermodynamics: internal energy

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SUMMARY

The discussion centers on the concept of internal energy in thermodynamics, specifically the equation U = q + W. Participants confirm that W represents the total work done, not limited to pressure work alone. The conversation highlights the inclusion of other forms of work, such as electrical work, particularly in the context of batteries and fuel cells. The equation is further elaborated with the formulation W = -P dV + W_other, emphasizing the need to consider various work types in thermodynamic calculations.

PREREQUISITES
  • Understanding of the first law of thermodynamics
  • Familiarity with the concepts of work and heat transfer
  • Knowledge of pressure-volume work in thermodynamic systems
  • Basic principles of electrochemistry related to batteries and fuel cells
NEXT STEPS
  • Study the first law of thermodynamics in detail
  • Explore the concept of non-PV work in thermodynamics
  • Learn about the thermodynamic cycles involving batteries and fuel cells
  • Investigate the mathematical formulations of work in various thermodynamic processes
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Students and professionals in physics and engineering, particularly those focusing on thermodynamics, electrochemistry, and energy systems.

iScience
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internal energy U=q+W

so far we've only been substituting -PV into W but i just wanted to be sure that the W is the total work and not just the work done by the pressure right?
 
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iScience said:
internal energy U=q+W

so far we've only been substituting -PV into W but i just wanted to be sure that the W is the total work and not just the work done by the pressure right?

Right. Another common kind of work is electrical, when looking at the thermodynamics of batteries and fuel cells, for instance. You will often see fomulations of the kind
$$
W = -P dV + W_\text{other}
$$
 

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