Heat energy added to a system under isothermal conditions appears as:
Correct answer: A. Work done by the system
- A. Work done by the system
- B. Work done on the system
- C. Increase in internal energy
- D. Increase in temperature
Explanation
In an isothermal process, the heat energy added to a system results in work done by the system. This is because the process keeps the temperature constant, meaning the internal energy does not change. According to the first law of thermodynamics, the heat added is fully converted into work. Therefore, Option A is correct. Option B is incorrect because it suggests energy is being applied to the system, rather than the system performing work. Option C is incorrect because the constant temperature implies no increase in internal energy. Option D is incorrect because the isothermal condition necessitates a constant temperature, ruling out an increase.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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