How do you calculate work done in a thermodynamic process?

Sample interview questions: How do you calculate work done in a thermodynamic process?

Sample answer:

Calculating Work Done in a Thermodynamic Process

1. Identify the type of work done:
2. Pressure-volume work (mechanical work)
3. Shaft work (mechanical work)
4. Electrical work

5. Magnetic work

6. Determine the appropriate thermodynamic equation:

7. Pressure-volume work: W = ∫PdV
8. Shaft work: W = τdθ
9. Electrical work: W = ∫Vdq
10. Magnetic work: W = ∫MdB

Pressure-Volume Work (Mechanical Work)

For a process involving a change in volume:

• If the process is reversible, the integral of PdV is calculated along the reversible path.
• If the process is irreversible, the integral is calculated along the actual path taken by the system.

Shaft Work (Mechanical Work)

For a process involving a rotating shaft:

• τ is the torque applied to the shaft
• dθ is the infinitesimal angle of rotation

Electrical Work

For a process invo… Read full answer

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