Exam-style question
Try this first
How does the first law of thermodynamics apply to an isothermal process?.
- A.The change in internal energy is zero.
- B.Heat added equals work done.
- C.Both heat and work are zero.
- D.The internal energy increases.
Model answer
What a good answer should say
- The change in internal energy is zero.
Explanation
Why this works
According to the first law of thermodynamics, for an isothermal process, the internal energy remains constant, thus the change in internal energy is zero, and any heat added to the system is equal to the work done by the system.
Common mistake
No common mistake is linked to this question yet.